...it is atmospheric pressure on the mercury in the cup that supports the column in the tube. Measure the height of the column in the tube above the level of the mercury in the cup. Incline the MECHANICS OF FLUIDS. tube, and again determine the difference of level. Why the same?...

...with soap that it will not stick to the cylinder. It should move with very little friction. Measure the height of the column in the tube above the level of the water in the cylinder, and its diameter, and compute its volume and weight. Compare this weight with...

...the mercury in the cistern is depressed, whilst that in the tube rises. This pressure is measured by the height of the column in the tube above the level of the mercury in the cistern. In the Fortin barometer the level of the surface of the mercury in the cistern when screwed up to exactly...

...equals the pressure transmitted to the open end of the tube. The normal height of this column of mercury in the tube above the level of the mercury in the cistern is 760 mm. at sea level. The pressure of the mercury on I sq. cm. at the point b within the tube is the...

...vessel. As a vacuum forms in the vessel and the upper part of the tube, mercury rises as a continuous column in the tube above the level of the mercury in the cistern, and when the process of exhaustion is complete, and a perfect vacuum is formed, this column stands...

...exactly balances the pressure of the atmosphere. The height of the top of the column above the surface of the mercury in the cistern is measured by means of a scale graduated in inches or millibars or both. The space between the mercury and the top of the tube...