Mercury Barometer?

Question

Why is the diameter of a mercury barometer irrelevant?

Answer 1

The weight of the column of mercury in the barometer tube =AHdg, where 'A' is area of the cross section of the tube,'H' is the height of the mercury column, 'd ' is the density , and ' g ' is the acceleration due to gravity.
But the pressure ' p ' is the weight per unit area.So if you devide AHdg by 'A' you get p=Hdg . You can notice here that the pressure is independent of the the area of cross section of the barometric tube.

Answer 2

A mercury barometer measures atmospheric pressure. Assuming that atmospheric pressure is constant across the area of the instrument, it will create equal force regardless of the diameter size. Therefore, if the diameter is 2 cm or 2 inches, the atmospheric pressure would still exert the same amount of pressure as long as the instrument is calibrated for that diameter.

Answer 3

Diameter Of Mercury

Answer 4

The vapor stress of Mercury (the stress the Mercury molecules that have transitioned into the vapor section exert on the liquid Hg) is amazingly low whilst in comparison with maximum different components. At 40 two stages C, Mercury has a vapor stress of a few million Pascal. At one hundred twenty stages C, Hg has a vapor stress of approximately a hundred Pa. by employing assessment, water has a vapor stress of 7.3814 kPa at 40 stages C and its vapor stress equals atmospheric stress at its boiling factor (a hundred stages C, vice chairman = one 0 one.325 kPa). one thousand Pa = a million kPa one 0 one.3 KPa = a million atm a million atm = 760 mmHg So even taking the vapor stress of Mercury into consideration, the vacuum over a barometer continues to be extremely reliable.