pressure

[Thunderchild]

do i remeber right that the 76 cm mercury colum weighs 1 kg (1 sqr cm base of course) so that is 1 bar or atm. basically the air guage on the printing press at work goes from 10 to 76 cm of mercury (Hg) so the maximum of the guage is 1 atm and every cm is  1 76th of an atm

[tony1941]

No! Your memory is playing tricks!  A column of mercury 76cm high with a cross sectional area of 1 square cm contains 76 cubic cm of mercury.  The density of mercury is, I recall 13.6 grams per cubic cm, so the mass (weight) = 1033.6 grams.  True, it's close to 1kg, but not exact, and also irrelevant. The rest of your statements are all OK.  (you must be almost my age to be able to work with cm and grams; I remember being really upset when it all became metres and kilograms!

[Hippy]

You mean to say it's not in bushels and cubits any more?

[Thunderchild]

I am 22 and live in S Italy and havn't the foggiest about imperial measurements exept a few equivalences. well perhaps the colum of mercury is 75.99ecc cm tall and was rounded to 76 cm i mean u have to consider the temperature as well and considering i just wanted to check my vague memory i'm satisfied. if your interested in know the air preassure gauges on the printing press i use at work (prints 50 X 70 cm and uses air suckers and blowers to pick up the paper and launch it into the machine) r in cm of Hg (mercury)