Question

Want the working of a manometer?

Answer 1

FULL ANSWERWhen these devices were first put into use, they commonly used mercury to measure instead of water. This practice lead scientists to the use of the term millimeters of mercury or mm Hg. As science developed the terms changed and one mm Hg is now called one Torr. This measurement signifies that one Torr of pressure is exactly one millimeter of change in the liquid inside the tube. The sealed side would go up by one millimeter while the open side of the tube would drop.The use of these meters isn't exclusively to test air pressure alone. They are also used to calibrate various devices. They can vary from the u-shape that is commonly seen, to versions that are smaller, portable and connected to a computer interface. These types of setups can be connected to pressure sensitive machinery and used to adjust or calibrate the amount of pressure exerted by it

Answer 2

Aim: To understand the working of a manometer.

From a rubber balloon, cut a small piece of rubber and cover the mouth of a thistle funnel using this cut portion. Connect the thistle funnel using a rubber tube with the manometer. Fill the manometer with a coloured liquid. The manometer consists of a glass tube in which the liquid is filled. The glass tube is supported by a wooden board and it has graduations marked on it. Dip the thistle funnel in a beaker filled with water. Mark this position as A. Note the reading in the manometer. Lower the funnel deeper into the beaker and mark this position as B. Note the reading again in the manometer. Now, note the difference in the two readings. This difference tells us the pressure exerted by the liquid at different depths.