About 2 1 pound per square inch = 2.0362... inches of mercury
5.57742782 feet
30cm are in a feet
A water barometer would have to be many feet tall because the density of water is much lower than that of mercury. In addition, the vacuum above the column would be spoiled by the water vapor pressure, far higher than that of mercury, and strongly temperature dependent.
14öösquare feet
It has a radius of approx 8005250 feet, 244000000 centimetres or 2668416 yards.
12" make a feet.
As close to 30 as makes no difference.
1 inch of mercury is equal to 1.133 feet of head.
Mercury was chosen for barometers because it is a dense liquid that is more sensitive to changes in atmospheric pressure compared to other fluids. This makes it an ideal substance for accurately measuring and indicating variations in atmospheric pressure. Additionally, mercury does not evaporate easily at room temperature, further enhancing its suitability for this application.
1.524 meters are in five feet.
7 feet