The first accurate measurements of the properties of gases at high pressures were made by E.H. Amagat in France between 1869 and 1893. Before developing the dead-weight gauge, he worked in a mine shaft and used a mercury manometer for pressure measurement. He reached a pressure of 430(atm). If g is 9.78(m)/(s)2 and if the temperature of the mercury manometer is 20(°C), what height of manometer is required to attain this pressure.