Two students debate why a sealed bottle of soda goes flat faster when left open.

Student A: Carbon dioxide (mathrmCO_2) gas escapes because the pressure above the liquid drops when the cap is removed, and gases are less soluble at lower pressure.

Student B: The mathrmCO_2 escapes only because the soda warms to room temperature, and gases are less soluble at higher temperatures.

An experimenter measures equal mathrmCO_2 loss from two open bottles kept at the SAME temperature but under different air pressures, with more loss at lower pressure.