Agas bbq grill usss propane gas, the propane is stored in a rigid tank. what happens to the pressure of the propane when the tank is left outside on a hot summer day & a cold winter day?

Water is initially present in a state where its molecules are far apart. during a change of state, its molecules slow down. which change of state has most likely taken place? from a gas to a liquid from a liquid to a gas from a solid to a liquid from a gas to a plasma