Can you explain the working of constant volume gas thermometer and constant pressure gas thermometer
Constant Volume Gas Thermometer:
- A constant volume gas thermometer ususally consists of a bulb filled with a fixed amount of a dilute gas which is attached to a mercury manometer.
- The manometer is used to measure variation in pressure.
- This thermometer works on the principle of Law of Gay-Lussac.
- The law states that when the temperature of an ideal gas increases, there is a corresponding increase in pressure.
- Also, when the temperature decreases, the pressure too decreases correspondingly.
- This is how constant volume gas thermometers traces the increase in temperature with the change in pressure while the volume remains constant.
- These types of thermometers are used in calibration of various other thermometers.
- The constant pressure gas thermometer is based on the relationship between the variation in voluime with the corresponding variation in the temperature while the pressure of the process remains constant.
- This consists of a long, thin glass tube with a known constant mass of air and mercury sealed inside by a rubber stopper.
- Such processes are called as the Isobaric process.
- The tube, air, and mercury are then surrounded by a larger, opentube through which liquid or gas can freely pass.
- On changing the temperature of the inner tube, the air either expands or contracts, moving the mercury along the tube.
- Measuring the amount of movement of the mercury gives us a relationship to how much it has expanded at certain temperatures
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