The temperature of an ideal gas can be physically by a change in the volume of the ideal gas.
The temperature of an ideal gas can be directly measured physically using a constant pressure gas thermometer.
The constant gas thermometer works on the principle of Charles' law which states that at constant pressure, The volume of a fixed mass of of an ideal gas is directly proportional to its temperature.
A constant pressure gas thermometer consists of a long, thin glass tube with a known constant mass of air and mercury sealed inside by a rubber stopper. The tube, air, and mercury are then surrounded by a larger, open tube through which liquid or gas can freely pass.
When the temperature of the gas changes, there is a corresponding increase in the volume of the gas.
The temperature of the gas is calculated using the following relation:
[tex]\frac{V_{1} }{T_{1} } = \frac{V_{2} }{T_{2} }[/tex]
Where;
Therefore, the temperature of an ideal gas can be physically by a change in the volume of the ideal gas.
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