An air thermometer has a bubble of liquid inside the tube and when the air inside of the tube heats up or cools down, the air takes up either more or less space inside of the tube, causing the bubble of liquid to either move upwards or downwards, indicating the temperature.
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An air thermometer uses the expansion and contraction of a liquid, typically alcohol or Mercury, in response to changes in temperature. As the temperature rises, the liquid expands and rises in the thermometer tube, and as the temperature decreases, the liquid contracts and lowers in the tube. This change in volume is then calibrated to display the corresponding temperature on the thermometer scale.
Thermometer
The temperature of the air is measured using a thermometer. This device can help determine how hot or cold the air is at a specific location. Temperature is usually expressed in Fahrenheit or Celsius degrees.
Yes, above the mercury or the other liquid.
The cause is an udesired absorption of air.
You would use a thermometer to measure air temperature.