![]() Such processes involving the constant pressure are said to be isobaric processes. In the case of a constant pressure gas thermometer, the fact that on keeping pressure constant, volume of the given mass of gas varies linearly with the absolute temperature. Using these temperatures can be determined in a constant volume gas thermometer. Coming to the calculation part, to find the temperature at certain pressure T = a P + b ) T = 2 7 3. ![]() But, it should be noted that the pressure and the temperature of the gas should be such that its form remains gaseous. The temperature of the gas its pressure will increase linearly, and on decreasing the temperature of the gas its pressure will also decrease linearly. ![]() This is the working principle of constant volume gas thermometer, i.e.Now, on varying the temperature of the sample, its pressure will vary as well, according to what Gay-Lussac said in the law: for constant volume, the pressure of the given mass of gas varies linearly with its absolute temperature. One of which is having a fixed amount of mercury up to a fixed point while for the other part mercury can move up or down. As shown in the figure above the mercury manometer has two arms to carry mercury,.Looking at the construction of a constant volume gas thermometer, it consists of a tube or bottle for holding the dilute gas, and a mercury manometer to measure the pressure of the gas. Their crucialness lies in the point that these thermometers are used to calibrate other thermometers, as their temperature scale coincides with the thermodynamic scale. States that if two bodies individually are in thermal equilibrium with a third body then, the two bodies will also be in thermal equilibrium with each other. ![]() A constant volume gas thermometer works on the zeroth law of thermodynamics, which.Now that we have learned the principle of gas thermometers and understood what absolute zero is, let us learn about different kinds of gas thermometers. ![]()
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