The density of mercury is 13560 kg/m³. Therefore the density of water is about 1000 kg/m³. 1 atm pressure is 101325 Pa. g = 9.8 m/s²
The height of a water column, h, needed to measure 1 atm is given by (1000 kg/m³)*(9.8 m/s²)*(h m) = 101325 Pa h = 1013225/9800 = 10.3393 m = 1033.93 cm
