Aquantity of an ideal gas is kept in a rigid container of constant volume. if the gas is originally at a temperature of 19°c, at what temperature will the pressure of the gas double from its base value ?

Awater-filled u-tube manometer is used to measure the pressure inside a tank that contains air. the water level in the u-tube on the side that connects to the tank is 5 ft above the base of the tank. the water level in the other side of the u-tube (which is open to the atmosphere) is 2 ft above the base. determine the pressure within the tank.