If the air pressure in the room decreases while the temperature remains constant, the volume of the balloon will increase. This behavior can be explained by Boyle's Law, which states that the pressure of a gas is inversely proportional to its volume when temperature is held constant.
In other words, when the pressure decreases, the gas molecules inside the balloon are not being compressed by the external air pressure as much, allowing the gas inside the balloon to expand, and thus the volume of the balloon increases.
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