What happens to a gas that is enclosed in a rigid container when the temperature of the gas is increased?
a. the gas particles move faster and collide more frequently, which causes an increase in pressure.
b. the gas particles move slower and repel one another, which causes a decrease in pressure.
c. the gas particles expand and take up more space, which causes an increase in pressure.
d. the gas particles become smaller and take up less space, which causes a decrease in pressure.