Question

An air thermometer can be constructed by using a glass bubble attached to a piece of small-diamter glass tubing. The tubing contains a small amount of colored water that rises when the temperature increases and the trapped air expands. You want a 0.20 cm3 change in volume to equal a 1° C change in temperature. What total volume of air at 20° C should be trapped in the apparatus below the liquid?
In a certain experiment a sample of Helium in a vacuum system was compressed at 25 degrees C from a volume of 200.0 mL to a volume of 0.240 mL where its pressure was found to be 30.0 mm Hg. What was the orginal pressure of the Helium?

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