Increasing this quantity will also increase the pressure of a gas.

• A. Moles
• B. Volume
• C. Temperature
• D. Pressure

Answer: (C)

When the amount of gas and the volume are fixed, increasing temperature raises pressure. Temperature reflects the average kinetic energy of gas molecules. Hotter molecules move faster and collide with the container walls more vigorously, increasing the force per unit area and thus the pressure. The ideal gas relation P = nRT / V shows this directly: with n and V constant, P grows in proportion to T. A simple example is a sealed tire: warming the air inside raises its pressure. Adding more moles would also raise pressure at fixed volume, but this question focuses on temperature as the variable that increases pressure under those fixed conditions.