. Elementary physics and chemistry: first stage . Fig. 61 —The tilted glass tube is full of mercury, but if it is placed upright in the position A the mercury will not fill it, and there will be nothing visible in the part C. mercury 30 inches in length. No matter if the closed tube is 30 feet long, the top of the mercury column will only be about 30 inches above the level of the mer- cury' in the cistern. Weight of a Column of the Atmosphere.— If the tube had an area of exactly one square inch, there would be 30 cubic inches of mercury in a column 30 inches long ; and since the mass of a cubi
. Elementary physics and chemistry: first stage . Fig. 61 —The tilted glass tube is full of mercury, but if it is placed upright in the position A the mercury will not fill it, and there will be nothing visible in the part C. mercury 30 inches in length. No matter if the closed tube is 30 feet long, the top of the mercury column will only be about 30 inches above the level of the mer- cury' in the cistern. Weight of a Column of the Atmosphere.— If the tube had an area of exactly one square inch, there would be 30 cubic inches of mercury in a column 30 inches long ; and since the mass of a cubic inch of mercury is about half a pound, the whole column would have a mass of 15 lbs. This column would balance a column of air of the same area, so that we find that the weight of a column of air upon an area of one square inch, and extending upwards to the top of our atmosphere, is equal to the weight of 15 lbs. when the barometer stands at 30 inches. Mercury is a Convenient Liquid for Barometers.—Mercury Fig. 62. —The mass of a cubic inch of mercurv' is i lb.; therefore, that of 30 cubic inches is 15 lbs.
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