Natural gas is stored in very large vessels consisting of a floating tank and a liquid seal. The pressure in the tank is constant because the weight of the floating tank is constant. In the morning, the temperature of the natural gas is 300 K. In the morning, the top of the tank is 50 m above ground level. What is the height above ground level in the afternoon? Assume that the natural gas behaves as a perfect gas and that no gas has been removed or added during the day.