How does temperature affect the pressure of gas in a cylinder?

The relationship between temperature and gas pressure in a cylinder is described by Gay-Lussac's Law, which states that the pressure of a gas is directly proportional to its absolute temperature, provided the volume remains constant. This means that when the temperature increases, the kinetic energy of the gas molecules also increases, causing them to move more vigorously and collide with the walls of the cylinder with greater force. This results in an increase in pressure within the cylinder.

In summary, higher temperatures lead to an increase in the pressure of the gas, making the first choice the correct one. The other options do not accurately reflect the behavior of gases under changing temperature conditions.