Question

What will cause the gas pressure inside a container to decrease?

Answer 1

A decrease in temperature inside the container will cause the gas pressure inside a container to decrease.

Guy Lusacc's law gives the relationship between temperature and pressure.

$\frac{P_1}{T_1}=\frac{P_2}{T_2}$

This gas law says that pressure and temperature are directly related ( in terms of Kelvin). If the temperature decreases the pressure will also decrease.

Temperature is a measure of kinetic energy. When the temperature inside the container decreases the kinetic energy will also decrease.

This means that the molecules inside the container will slow down and have less energy. With less energy, the molecules will hit with less force creating less pressure.