Operational definitions Two identical empty plastic bottles were outside on a ho

Question

Operational definitions Two identical empty plastic bottles were outside on a hot afternoon. They were initially uncapped. At about three o'clock, a physicist tightly capped one of the bottles, bottle A. By midnight, the weather had turned very cold. When the physicist observed the bottles at midnight, she found that the sides of bottle A were caved in, but bottle B was the same shape it had been in the afternoon. Based on the information given, answer the following questions. Explain your reasoning. Did the mass of air inside bottle A increase, decrease, or remain the same from 3 P.M. to midnight? Explain. Did the volume of air inside bottle A increase, decrease, or remain the same from 3 P.M. to midnight? Explain. Did the volume of air inside bottle B increase, decrease, or remain the same from 3 P.M. to midnight? Explain.

Explanation / Answer

A) Mass of air inside A remains the same as it was capped for the specified duration, and no air could get in or out of the bottle.

B) As bottle A shrinks, which clearly is the result of decrease of volume of air due to cooling of air nside it.

C) Volume of air in B remains the same as the bottle does not changes size for the entire period.

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