The collapse of a helium balloon as it leaves the warmth of a florist shop for a sub-zero February morning is best explained by Charles' Law.

Question

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Charles' Law states that the volume of a gas is directly proportional to its temperature (in Kelvin), assuming the pressure and the amount of gas remain constant. When a helium balloon moves from a warm florist shop to a cold environment, the temperature of the helium gas inside the balloon decreases, causing the volume of the gas (and thus the balloon) to decrease as well, leading to the balloon's collapse.

The Collapse of a Helium Balloon as It Leaves the Warmth