The gas in the piston is being heated, and the piston has moved upward. The observation will be summarized in a row of the incomplete table below. Open image in full-screen view Row Name Observation Variables 1 Boyle's law Volume increases when pressure decreases ? 2 Charles’s law ? ? 3 Gay-Lussac’s law ? Temperature, pressure 4 Combined gas law ? ? What are the variables for this piston?
C
volume and number of moleculesD
pressure and number of moleculesHeating the gas raises its temperature, and the piston moving upward means the gas volume increases. This describes Charles’s law: temperature and volume change while pressure and the number of molecules remain constant. The variables are temperature and volume, choice B.
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