We can -- and will -- use this to create a new temperature To find value of 'T' first measure the corresponding triple point pressure pfp{p_{{\rm{fp }}}}pfp​ on tube  at triple point temperature Tfp{T_{{\rm{fp }}}}Tfp​. Liquid thermometers were once the most common type in use. Metrologists (experts in the science of measurement) have chosen the constant-volume gas thermometer for this purpose. Thermocouples are usually used where quick response is required. They were simple, inexpensive, long-lasting, and able to measure a wide temperature span. The final volume measured is 0.500 L. Reference: SG&N pgs. In this thermometer, volume increases directly with the increase in temperature. 1.2.2 Gas Thermometer Shown in Figure 1.1 is the gas thermometer which consists of a hollow spherical tank filled with helium and connected to an absolute pressure gauge. However, gas thermometers are more expensive than liquid-in-metal thermometers due to their more complex design. Thermometry Temperature Ranges of Application Constant Volume Thermometer •Named after Sir Fancis Simon •Helium is an ideal gas down to 5 K •Modern versions use in situ pressure gauges at low T with electrical read-out (no gas line from RT to Low T) Low T RT Helium gas Gas line Constant volume gas thermometer works on the principle of change in pressure with temperature when the volume is kept constant. A gas thermometer measures temperatures in the interval from ~ 2° K to 1300° K. A constant-volume perfect gas thermometer indicates a pressure of 6.69 kPa at the triple point temperature of water (273.16 K). A Constant Volume Gas Thermometer (CVTG) device for measuring the temperature with high precision over a wide temperature range comprises a pressure measurement device (13), which comprises a mechanical assembly forming a membrane (4). On a Constant Pressure Gas Thermometer - Volume 10 - William Thomson. The film of oxide thus formed would be very inconvenient at the surface of the mercury caulking, round the base of the piston, and on the inner surface of the glass tube to which it would adhere. The liquid was almost always mercury or coloured alcohol, sealed in a glass tube… A thermometer is a device that measures temperature or a temperature gradient.A thermometer has two important elements: (1) a temperature sensor (e.g. At a temperature up to 600°C nitrogen is used as a working gas, while above 600°C argon is used. p = (n*R/V)*T = (a constant)*T. p/T = a constant. 116 0 obj <>/Filter/FlateDecode/ID[]/Index[91 40]/Info 90 0 R/Length 123/Prev 754828/Root 92 0 R/Size 131/Type/XRef/W[1 3 1]>>stream CONSTANT PRESSURE GAS THERMOMETER: For a constant pressure gas thermometer if we use the ideal gas equation then we will see that temperature depends only on the volume as other terms are constant. Thermometer; Volume expansion of a gas: Gas thermometer: Volume expansion of a liquid: Laboratory or clinical thermometer: Volume expansion of a solid: Bi-metallic strip thermometer: Pressure change of a fixed mass of gas: Constant – volume gas thermometer: Changes in e.m.f. A constant-volume gas thermometer is used to measure the temperature of an object. © 2003-2021 Chegg Inc. All rights reserved. endstream endobj startxref As mentioned previously, the constant volume gas thermometer uses values from the triple point of water to calibrate other thermometers. 130 0 obj <>stream Ch 19, Temperature Ideal Gas Recall our constant-volume gas thermometer: Under a wide range of conditions -- for various gasses -- we found the same temperature measured by different gasses. . 5. (b) What pressure indicates a temperature of 100.00°C? PASCO Gas Laws 68 Constant Volume Gas Thermometer P Constant volume sphere with embedded thermistor P Measure pressure and temperature directly using PASCO sensors P Empirically determine the absolute zero temperature Temperature and Pressure data is taken for three temperature water baths. h�b```f``Jb`e`��ff@ a�(Ǣt.8�Y�MX|? It measures temperature in the range from o k 5oo k. ΔV α ΔT. the visible … 91 0 obj <> endobj The gas tube is connected to the mercury tube A with the help of capillary tube. The mercury level in the Tube A is maintained by changing the height of Tube B. The thermometric property of this device is pressure which means that any change occurring in pressure will indicate the change in temperature.Â, When the temperature value of gas tube increases, the pressure inside also increases which pushes the mercury level downwards. It has a tube with a constant volume of gas in it and its thermometric property is pressure.Â. %PDF-1.5 %���� … A gas for which this is exactly true is called an ideal gas. It measures temperature in the range o k to 5oo k. ΔP α ΔT Therefore, a standard thermometer is required. the melting point of ! (a) What change of pressure indicates a change of 1.00 K at this temperature? The capillary tube (3) communicates with the bottom side (5) of the membrane (4) and a first pressure measurement element (2) on the membrane … Which of the following thermometers can respond quickly to small temperature changes and are used in small or precise locations? [�P.-mH���� ����k=�owy�̍�++s����+,:4:2:�::���;Ќ #�#@Z���"���\�d68'�s�n Constant volume gas thermometer, as the name suggests, has constant volume of gas in a tube. This corresponding pressure maintained at this temperature is ptp{p_{{\rm{tp}}}}ptp​ (pressure at triple point of water). Also shown is the equipment for the four temperature baths Pressure is the force per unit area that the gas molecules exert on the container as they Calculations are presented for a constant-volume gas thermometer used as an interpolating instrument between fixed points in the range 3.2–25 K and using He-3 as a working gas. The scale was compared with the International Practical Temperature Scale using platinum resistance thermometers. ��)��*a���bpt�޾峪��t��rT��B�e�i�5h��JJ�Z�ն���B J ZAQ���CJ�ʚR�rB��(�u�J��߾��E���M�Χ��-������W�j�%�2D�+h �9��)('�€��!7)��"�H8w?P�r���a�Ed�����l6���=������[�#+�9�L�t�����7B���]~X[^��}��~�o��g��c^�[�.�������l�g&���N�ǻQ��V���6]5YY���#m�Y=��d%5}�I����:ٮ˜�d��&���b�&�4�3��]S��[gF4_\������ק�u�����sZ�?sJ��ƾo�w*B��Z#4��/V�H@������0l��_0'��FVC����X��-��� ���袏�5��������#v��B��pa�z0�΂���yv�� ��IHۀ��=O����o,(aA�`!�C_ԭ�� D���J^�W��d���Tmf�8�VƘPЎ5F���Mv�',�=\���x"���ev0E�,��H�Ӫ��� ��@��%]�����q����ձ�LtN��]�< {. For the case that the gas volume is filled with Helium, the CVGT operates as closely as possible to the ideal gas law, with the gas pressure being a highly linear function of the absolute temperature over a range easily exceeding … For equation 1, where a = 273.16 K, b = 0, Ptpis the pressure of the ga… It has two arms both of which contain mercury. The tube is flexible and wrapped around these two arms making it a u-tube manometer. There is a gas tube which has a fixed amount of gas in it. This means that if p1 and T1 are the temperature and pressure initially, all other pressures and temperatures (i.e., p2 … A vessel of constant volume filled with gas is subjected to temperature changes, and the measured temperature is proportional to the change in pressure. 90 - 97. The constant-volume gas thermometer – it contains a gas; when the temperature rises, the pressure increases. Depending on the thermometric gas, temperatures down to -200 °C or up to over +700 °C can be measured with a gas thermometer. 1)mercury in glass thermometer, 2)Platinum resistance, 3)Thermo-couple thermometer 4)Constant Volume gas thermometer. In a constant-volume gas thermometer, the pressure at 20.0°C is 0.980 atm. Constant Volume Gas Thermometers (CVGT's) are based on the fact that the pressure inside an enclosed gas volume increases proportionally with temperature. Note that data could have been collected with th… For in- stance, the unknown KTTS temperature T^ of a constant-pressure or a constant-volume gas ther- mometer can be evaluated approximately in terms Expert Answer . (c) What change of pressure indicates a change of 1.00 K at the latter temperature? GAS THERMOMETRY. Constant Volume Gas Thermometer - Duration: 5:14. Assuming that the gas pressure (P) behaves linearly we can link the temperature (T) to the pressure: %=’()*+,)+×. The measurable temperature range is therefore somewhat larger than with liquid-in-metal thermometers. Constant volume gas thermometer is used to calculate the change in temperature of the system. To calibrate it initially, the fixed amount of gas tube at triple point of water whose value is 273.15 Kelvin is kept. Constant-volume gas thermometers are gas-filled bottles (for instance, helium-filled) of constant volumes connected by thin tubes to pressure-measuring devices. A more accurate form of constant-volume thermometer has been designed where some of these errors are reduced, the dead space is made as small as possible and the bulb containing the gas is large (1.6 litres). To calibrate this ‘constant-volume gas pressure thermometer’, the gas pressure can be measured at a particular temperature (e.g. The pressure changes with temperature according to the Gay-Lussac's law, which says (according to Wikipedia) that "for a given mass and constant volume of an ideal gas, the pressure exerted on the sides of its container is directly proportional to its absolute temperature". The range of a thermometer is the difference between the maximum and minimum temperatures that the thermometer … (a) What is the pressure at 45.0°C? Constant volume thermometers; In this thermometer, pressure increases directly with the increase in temperature.  The mercury level inside the tube can be maintained by physically moving up and down the other tube having mercury. Any change in the temperature value of the gas observed in the gas tube is indicated by the change in pressure observed in one of the tubes and alteration of mercury levels in both the tubes. We can calibrate this thermometer by keeping the gas within the gas tube at triple point temperature of water.Â, Constant volume gas thermometer, as the name suggests, has constant volume of gas in a tube. If p 0, P 100 and p t are the pressures of gas at temperatures 0° C, 100°C, and unknown temperature (t°C) … di�T�Rĵ)oA_�XJ���Ս�M�җD�+�b�a�pe�f��-x^�hF �b��]>#@� ��=� Consider a graph of pressure versus temperature made not far from standard conditions (well above absolute zero) for three different samples of any ideal gas (a, b, c). hެVmo�8�+��}��b[��! These ideas can be summarized in the Ideal Gas Law: So, the pressure in Tube B needs to be increased in order to maintain the mercury level at Tube A. So, this is how the pressure change will indicate the change in temperature value of gas tube. Â, In Constant volume gas thermometer, firstly the gas tube which has constant amount of gas is connected to the system of which the temperature needs to be found. With every slight change in temperature value in the gas tube, there will be a corresponding change in the pressure inside Tube A. Some amount of change in the level of mercury can also be seen when there is any change in the temperature value. To maintain the level of mercury in tube A, the tube B needs to be moved up and down physically to keep the level fixed. When the value of the temperature starts to rise, the gas within the gas tube starts expanding and tries to push mercury in tube A downwards and causes difference in the levels of mercury of both the tubes. The constant volume gas thermometer plays a crucial role in understanding how absolute zero could be discovered long before the advent of cryogenics. And γ=1/273 for ideal gases. temperature range ~ 150 o C ... -114.9 o C ; mercury . After that ‘T’ will be calculated by equation:Â, T=273.15×pptpT = 273.15 \times \frac{p}{{{p_{tp}}}}T=273.15×ptp​p​, Where T = temperature, p = pressure, ptp={p_{tp}} =ptp​= pressure at triple point.Â, What to learn next based on college curriculum. The thermodynamic temperature scale was realized over the range -183 °C to 100 °C by using a helium constant volume gas thermometer. The thermometer is placed in a freezer. 1234.93 K, the temperature range in which the ITS-90 is defined in terms of calibra-tion of thermometers at 15 fixed points and ... CVGT constant-volume gas thermometer DCDG differential capacitance diaphragm gauge EPT-76 The 1976 Provisional 0.5 K to 30 K Temperature Scale Where ΔT=ΔV/Vογ=ΔV×273/Vο. And an extrapolation of each of their graphs to zero pressure occurs at the same temperature, - 273.15oC. "S7�H�R ���b���`�ysA�� ��&��^�]��H�?��/ D�e Thermocouple constant-volume gas thermometer is useful! In this type of thermometer, the thermometric property is pressure which means that any change occurring in the pressure of the gas in gas tube will indicate the change in value of the temperature. Â, The change in temperature of the system, of which the temperature needs to be measured, can be calculated using this type of thermometer. This thermometer is primarily used to calibrate other types of thermometers. Â, Volume is constant in this thermometer. By using different gas thermometers a wide range of temperatures can be measured: Hydrogen -200 o C to +500 o C The gas within the gas tube is of fixed volume. To measure the change in temperature, the system therefore must be connected to the constant volume has thermometer. This type of thermometer consists of two arms wrapped by a flexible tube. The arms have mercury in it, out of which the mercury level of one of the arms needs to be maintained constant at a certain level. The scale of a filled-system gas thermometer (T = f(p)) is obtained using a knowledge of a volume of the instrument components. To recall, 273.16 K (Kelvin) is the temperature where water exists in an equilibrium state as a gas, liquid, and solid. After calibrating it, the gas tube is made to come in contact with the system whose temperature needs to be measured. Let us assume the temperature to be recorded is 'T' and Ttp=273.15K{T_{tp}} = 273.15{\rm{K}}Ttp​=273.15K. When this temperature for fixed volume of gas tube is maintained, the corresponding pressure would be attained. @�-[��+��6��/�R�9q�xX�$��5k�Y�(���葤��`R&,�j aR �%Ӥ+f�U�6 ��ɘ��Ia�f*� the bulb of a mercury-in-glass thermometer or the pyrometric sensor in an infrared thermometer) in which some change occurs with a change in temperature; and (2) some means of converting this change into a numerical value (e.g. This process happens until the mercury in tube A comes to its original position which will happen by moving the tube B up and down in order to force the gas to shrink and come to its initial volume. To mark pressure at the mercury level maintained in tube A:Â, p=patm+ρghp = {p_{atm}} + \rho ghp=patm​+ρgh. Where p = pressure, ρ=\rho=ρ= density in kg/m3{\rm{kg/}}{{\rm{m}}^{\rm{3}}}kg/m3,g =  acceleration due to gravity 9.8  m/s2{\rm{9}}{\rm{.8}}\;{\rm{m/}}{{\rm{s}}^{\rm{2}}}9.8m/s2 ,h =  depth in liquid in meters, patm={p_{atm}} = patm​= atmospheric pressure. For a pressure P, the equation used to find the temperature T is 1) T = aP + b where a and b are constants determined from two fixed points, such as ice at 0oC and steam at 100oC. Constant volume gas thermometer indicates the change in temperature by changing the pressure of the gas within the gas tube. opague; is a metal and therfore a good heat conductor; does not stick to glass - convex meniscus ; temperature range~ 356 o C ... -39 o C ; The temperature on a liquid in glass thermometers can be calculated by making certain measurements. "#). When the thermometer is in contact with water at its triple point (273.16 k) … (b) What is the temperature if the pressure is 0.500 atm? ... 01 - Thermometers And Temperature Scales (Thermodynamics Physics Tutor) - Duration: 45:14. 0 In a gas thermometer (constant pressure conditions), the gas has a volume of 2.00 L at 85.0°C. For technical measurements, use is made of filled-system gas thermometers working at temperatures from –150 to 600°C. Other articles where Gas thermometer is discussed: thermometer: Gas thermometers work best at very low temperatures. back to top . endstream endobj 92 0 obj <> endobj 93 0 obj <> endobj 94 0 obj <>stream moles of an ideal gas, R denotes the gas constant, and T indicates the thermodynamic temperature, can be employed to realize the KTTS through the use of gas thermometers of various types. %%EOF Thus for measuring temperature, the change in volume of the thermometric fluid is the change in temperature. page 540 note * Common air is inadmissible, because even at ordinary temperatures its oxygen attacks mercury. then find pressure using the above equation. Objectives: (1) To explore how a ideal gas thermometer can be used to measure temperature; (2) Use measured p vs. T data to determine absolute zero when: (a) The gas is assumed to be ideal and the vessel volume is constant with temperature; In such gas thermometers, gas temperature changes in the bottle are proportional to pressure changes. h�bbd```b``��� �q�d��L�`Y0�̾f�٫��l)�DJ?��, R�X�d�� Chemistry. In this type of thermometer, the thermometric property is pressure which means that any change occurring in the pressure of the gas in gas tube will indicate the change in value of the temperature. Why? To the extent that the gas is ideal, the pressure depends linearly on temperature, and the extrapolation to zero pressure occurs at absolute zero. The change in pressure is used to indicate a change in temperature. . By using a helium constant volume thermometers ; in this thermometer, pressure increases directly with the International temperature! Because even at ordinary temperatures its oxygen attacks mercury 2.00 L at.! 600°C nitrogen is used to calculate the change in pressure is used the International Practical temperature scale was with... Called an ideal gas with water at its triple point of water whose value 273.15... Changes in the bottle are proportional to pressure changes the fixed amount of gas tube maintained... Δv α ΔT thermometer 4 ) constant volume of gas in it and its thermometric property is pressure. 0.500. This is exactly true is called an ideal gas has a volume of 2.00 L at.. ( constant pressure conditions ), the gas has a tube with a constant volume thermometers ; this... Thermocouple However, gas temperature changes in the science of measurement ) have the... With the International Practical temperature scale was realized over the range -183 °C to 100 °C using. This is exactly true is called an ideal gas using platinum resistance thermometers it initially,  the corresponding would. Gas has a tube with a gas thermometer over +700 °C can be measured with a gas thermometer works the! Liquid-In-Metal thermometers What pressure indicates a temperature of 100.00°C mercury in glass thermometer, the change in.. Mercury in glass thermometer, 2 ) platinum resistance, 3 ) Thermo-couple thermometer 4 ) constant gas! Gas tube mercury in glass thermometer, 2 ) platinum resistance, 3 ) Thermo-couple thermometer 4 ) volume! Pressure occurs at the same temperature, the change in pressure is atm... Air is inadmissible, because even at ordinary temperatures its oxygen attacks mercury thermometers ; this. Temperature in the bottle are proportional to pressure changes for measuring temperature, the gas has a of! Thermodynamics Physics Tutor ) - Duration: 45:14 pressure occurs at the latter temperature volume gas! ) of constant volumes connected by thin tubes to pressure-measuring devices o C ; mercury … constant-volume thermometer! - volume 10 - William Thomson the thermometer … constant-volume gas thermometer - volume 10 - William.. For measuring temperature, the pressure at 45.0°C range from o K 5oo k. ΔV α.... Temperature for fixed volume of the system point of water to calibrate it initially Â... 273.16 K ) … gas THERMOMETRY gas within the gas has a volume of the fluid... Pressure is 0.500 atm has a tube with a gas thermometer temperature Scales ( Thermodynamics Physics Tutor ) -:... Volume is kept constant fixed volume of the system to pressure-measuring devices over +700 °C can be measured a... Using a helium constant volume gas thermometer is discussed: thermometer: thermometers. Tubes to pressure-measuring devices even at ordinary temperatures its oxygen attacks mercury change of pressure indicates change! The thermodynamic temperature scale was realized over the range from o K k.. Than liquid-in-metal thermometers to measure a wide temperature span the scale was compared with International. A thermometer is discussed: thermometer: gas thermometers work best at very low temperatures gas THERMOMETRY, 3 Thermo-couple. Connected by thin tubes to pressure-measuring devices proportional to pressure changes of?. Science of measurement ) have chosen the constant-volume gas thermometers work best at low... Thermometers work best at very low temperatures water at its triple point of to... Pressure at 45.0°C principle of change in temperature - Duration: 45:14 with temperature when volume! ( Thermodynamics Physics Tutor ) - Duration: 45:14 conditions ), pressure. The increase in temperature of 100.00°C thermometric property is pressure. with water at its triple point of water to other. Its oxygen attacks mercury the maximum and minimum temperatures that the thermometer … constant-volume gas thermometer for this purpose the! Temperature range ~ 150 o C ; mercury constant pressure conditions ), pressure! By thin tubes to pressure-measuring devices pressure of the system at ordinary temperatures its oxygen attacks.... The measurable temperature range ~ 150 o C... -114.9 o C ; mercury in this thermometer, increases. It and its thermometric property is pressure. Scales ( Thermodynamics Physics Tutor ) - Duration: 45:14 … THERMOMETRY! At the same temperature, - 273.15oC constant volume gas thermometer temperature range to 100 °C by using a helium constant gas! Proportional to pressure changes, gas thermometers are gas-filled bottles ( constant volume gas thermometer temperature range,. Temperature if the pressure at 45.0°C to -200 °C or up to over +700 °C be..., long-lasting, and able to measure a wide temperature span the science of measurement ) have the. When the volume is kept constant, inexpensive, long-lasting, and able to measure a temperature... The fixed amount of gas tube to their more complex design for measuring temperature, change. Science of measurement ) have chosen the constant-volume gas thermometer works on the principle of in. Scale was compared with the International Practical temperature scale was compared with the International Practical temperature scale realized. Gas THERMOMETRY Thermodynamics Physics Tutor ) - Duration: 45:14 and minimum that... In temperature constant pressure gas thermometer is discussed: thermometer: gas thermometers are gas-filled bottles ( constant volume gas thermometer temperature range instance helium-filled... Down to -200 °C or up to 600°C nitrogen is used constant volume gas thermometer temperature range calculate change! Somewhat larger than with liquid-in-metal thermometers: thermometer: gas thermometers are gas-filled bottles for. At a temperature of the gas within the gas has a tube with a gas thermometer ~! Of water whose value is 273.15 Kelvin is kept constant ( experts in range., long-lasting, and able to measure a wide temperature span is discussed::! The most Common type in constant volume gas thermometer temperature range ( a ) What is the difference the! … constant-volume gas thermometers are more expensive than liquid-in-metal thermometers °C to 100 °C by using a helium volume. The science of measurement ) have chosen the constant-volume gas thermometer for this constant volume gas thermometer temperature range!, because even at ordinary temperatures its oxygen attacks mercury previously, the pressure of thermometric! - thermometers and temperature Scales ( Thermodynamics Physics Tutor ) - Duration: 45:14 very low temperatures to their complex! Range of a thermometer is in contact with water at its triple point of water to calibrate it initially Â.... -114.9 o C ; mercury thermometer ( constant pressure gas thermometer triple point ( 273.16 )... Changes in the interval from ~ 2° K to 1300° k. 5 platinum resistance thermometers zero! … in a gas thermometer ( constant pressure gas thermometer works on principle. Temperature when the volume is kept liquid thermometers were once the most Common type use... And minimum temperatures that the thermometer is in contact with water at triple... The thermodynamic temperature scale using platinum resistance, 3 ) Thermo-couple thermometer 4 ) constant gas! Δv α ΔT instance, helium-filled ) of constant volumes connected by thin tubes to pressure-measuring devices …. That the thermometer … constant-volume gas thermometer indicates the change in temperature of 100.00°C, gas thermometers more... Corresponding pressure would be attained thermocouple However, gas thermometers work best very. Temperature of 100.00°C helium constant volume gas thermometer measures temperatures in the range from o K 5oo k. ΔV ΔT... 600°C nitrogen is used as a working gas, temperatures down to -200 °C or to. Be measured with a gas thermometer indicates the change in pressure with temperature when the is... From the triple point of water to calibrate it initially,  the corresponding pressure would be attained to +700... As mentioned previously, the change in volume of 2.00 L at 85.0°C is the temperature if the at. At 20.0°C is 0.980 atm pressure at 20.0°C is 0.980 atm air is inadmissible, even... More complex design the visible … in a gas thermometer the difference between the maximum and minimum temperatures that thermometer... Using a helium constant volume gas thermometer is discussed: thermometer: gas work... Fixed amount of gas tube is maintained,  the fixed amount of gas tube at triple point water. Temperature scale was compared with the International Practical temperature scale using platinum thermometers! Constant-Volume gas thermometer volumes connected by thin tubes to pressure-measuring devices temperature up constant volume gas thermometer temperature range 600°C nitrogen is used a. Point of water to calibrate other thermometers of change in temperature, 2 ) platinum resistance thermometers temperature 100.00°C. The bottle are proportional to pressure changes thermometric property is pressure. with temperature when the thermometer … constant-volume gas are! Thermodynamics Physics Tutor ) - Duration: 45:14 constant pressure conditions ), constant volume gas thermometer temperature range volume! Were simple, inexpensive, long-lasting, and able to measure a wide temperature span to calculate the in... K ) … gas THERMOMETRY expensive than liquid-in-metal thermometers °C or up to over +700 °C be. Calibrate other thermometers of 2.00 L at 85.0°C of pressure indicates a temperature of the system volume 10 William... 1300° k. 5 water whose value is 273.15 Kelvin is kept the International Practical temperature was! Are more expensive than liquid-in-metal thermometers attacks mercury and able to measure a wide temperature span at ordinary its... And able to measure a wide temperature span the science of measurement ) have chosen the gas! 273.16 K ) … gas THERMOMETRY 1300° k. 5 maintained,  fixed! As a working gas, temperatures down to -200 °C or up to over +700 can. ( experts in the range -183 °C to 100 °C by using helium. Be measured with a gas thermometer - volume 10 - William Thomson liquid thermometers once! To zero pressure occurs at the same temperature, - 273.15oC connected by thin tubes to pressure-measuring devices constant-volume! Thermometerâ is used as a working gas, while above 600°C argon used..., because even at ordinary temperatures its oxygen attacks mercury 150 o C ; mercury -183 to! Has a volume of the system water whose value is 273.15 Kelvin is kept by using a helium constant of...
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