Consider a balloon that has a volume cap v It contains n moles of gas, it has an internal pressure of cap p , and its temperature is cap t If the balloon is heated to a temperature of 15 point 5 cap t while it is placed under a high pressure of 15 point 5 cap p , how does the volume of the balloon change?

For a fixed amount of gas, the ideal gas law gives V = nRT/P, so volume is proportional to temperature divided by pressure. The temperature and pressure are both multiplied by 15.5, so their ratio—and therefore the balloon’s volume—stays the same. The correct choice is “It stays the same.”

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