What is the relationship between volume and temperature for a gas?

• A. Directly related
• B. Inversely related
• C. No relation
• D. Not enough data

Answer: (A)

When a gas is kept at constant pressure, its volume increases as temperature increases. This direct relationship comes from the way gas molecules behave: higher temperature means higher kinetic energy, so the molecules move more vigorously and push outward on the container walls more, requiring more space. In the ideal gas framework, PV = nRT, so with pressure and the amount of gas fixed, volume is proportional to temperature (using Kelvin). That’s why increasing temperature leads to a larger volume under constant pressure.

If temperature rises but pressure is allowed to change, the exact relationship can vary, but the standard, commonly tested idea is that volume and temperature are directly related when pressure is held constant. The opposite relationship would arise if you held temperature constant while changing pressure (not the scenario here), and saying there’s no relation wouldn’t fit the well-established gas behavior under typical conditions.