Two practical applications of thermal expansion in gases
Answers
Answer:
Explanation:
Hot-air balloons are an obvious example of the practical use of the thermal expansion difference between a gas and a solid. Because the hot air inside the balloon bag increases in size faster than the container it stretches the bag so that it expands and displaces the colder (heavier) air outside the bag.
Answer:
Explanation:
VOLUME GAS THERMOMETERS.
Whereas liquids and solids vary significantly with regard to their expansion coefficients, most gases follow more or less the same pattern of expansion in response to increases in temperature. The predictable behaviour of gases in these situations led to the development of the constant gas thermometer, a highly reliable instrument against which other thermometers.
In a volume gas thermometer, an empty container is attached to a glass tube containing mercury. As gas is released into the empty container, this causes the column of mercury to move upward. The difference between the former position of the mercury and its position after the introduction of the gas shows the difference between normal atmospheric pressure and the pressure of the gas in the container. It is, then, possible to use the changes in volume on the part of the gas as a measure of temperature. The response of most gases, under conditions of low pressure, to changes in temperature is so uniform that volume gas thermometers are often used to calibrate other types of thermometers.