Absolute Zero Apparatus / Gay Lussac'S Law Determine the approximate value of absolute zero. Use this device to demonstrate the direct relationship of pressure and temperature of a constant volume of gas by measuring the pressure of a known amount of confined gas at several known temperatures. Includes a sealed volume connected to an absolute-reading pressure gauge, copper and brass immersible parts and 100 mm diameter bulb. You need a bicycle air pump and thermometer. Qty :