If the atmospheric pressure is 100,000 Pa, calculate the length of the tube of the barometer that uses water?
(Density of water= 1000 kg/m^3)
A pascal is a N/m^2 or kg/ m/sec^2
100, 000 kg / (m/sec^2) = x m x 9.81 m/sec^2 x 1000 kg/m^3
x =10.19 m Which is a long tube to deal with so : Often MERCURY is used instead (it is 13.56 times denser than water)
10.19 m / 13.56 = .751 m = 751 mm so a tube of less than 1 meter could be used if you use mercury instead of H2o