If a gas expands isothermally and its volume doubles, what happens to the pressure?

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Multiple Choice

If a gas expands isothermally and its volume doubles, what happens to the pressure?

Explanation:
Isothermal expansion means the gas’s temperature remains fixed. For an ideal gas, PV = nRT, and with temperature fixed, P is inversely proportional to V. If the volume doubles, the pressure must drop by a factor of two. Therefore the pressure halves. This happens because P = nRT / V, so doubling V makes P half as large. The other options would imply pressure behavior that conflicts with the constant-temperature relationship.

Isothermal expansion means the gas’s temperature remains fixed. For an ideal gas, PV = nRT, and with temperature fixed, P is inversely proportional to V. If the volume doubles, the pressure must drop by a factor of two. Therefore the pressure halves. This happens because P = nRT / V, so doubling V makes P half as large. The other options would imply pressure behavior that conflicts with the constant-temperature relationship.

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