Question

Liquid methylene iodide has a density of 3.33 g/mL. A barometer is constructed using methylene iodide instead of mercury. If the atmospheric pressure is 0.951 atm, what is the height of the methylene iodide column in the barometer in cm?
The density of liquid mercury is 13.6 g/mL

Answer 1

Since the force is the same, the height will be inversely proportional to the densities (because the cross-section has the same area) -- think about it: half as dense (half as much mass), twice as high.

So, if H is the height of mercury, the height h of iodide obeys

h = (13.6/3.33)H