In a sealed system, pressure and temperature do what?

• A. They rise together regardless of system state
• B. Follow each other up and down
• C. They remain constant at all times
• D. They change independently without relation

Answer: (B)

In a sealed system with fixed volume, pressure and temperature move together because the amount of gas is constant and volume doesn’t change. The relationship is described by P = nRT / V, so when temperature increases, the gas molecules move faster and push harder on the container walls, raising pressure; when temperature decreases, pressure drops. Therefore, pressure and temperature rise or fall in tandem. The other ideas don’t fit because pressure would not stay constant as temperature changes, and saying they change independently or rise regardless of state ignores this direct link.