- 1). Pour a liquid of known density into the U-shaped portion of the manometer. You must use enough liquid so that it rises up into the left and right sections of the U-tube. Density is a measure of the compactness of a given substance. For example, mercury has a density of 13,600 kilograms per cubic meter.
- 2
Employ a tape measure for finding distances.tape measure image by freshpix from Fotolia.com
Measure the difference in height that the liquid rises in inches between the left and right parts of the U-shaped pipe. As an illustration, assume the height difference is 20.0 inches. - 3). Convert the height difference measurement to meters by dividing by 39.37, because 1 meter consists of 39.37 inches. Performing this step leads to 20.0 inches divided by 39.37 inches per meter or 0.51 meters.
- 4). Multiply the height difference by the density of the liquid and 9.8 meters per second squared to obtain the pressure difference between the two reservoirs. If one reservoir is open to the atmosphere, this pressure is how much the closed reservoir differs from normal atmosphere pressure. The quantity 9.8 meters per second squared is the acceleration given to a freely falling object on Earth due to gravity. Completing the sample computation leads to 0.51 meters times 13,600 kilograms per cubic meter times 9.8 meters per second squared which equals 67,973 pascals. In the final step, the fact that a kilogram times meter squared per second squared equals a pascal is used.
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