How to Measure Differential Pressure
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How to Measure Differential Pressure Instructions 1.Measure the vertical distance between the fluid levels in the manometer in centimeters. Be sure to measure in a straight line. For example, the height difference might be 10.0 cm. 2.Convert the height difference into meters by dividing by 100. This step leads to a vertical distance of 0.10 m. 3.Multiply the density of the fluid in kilograms per cubic meter times the acceleration due to gravity times the height difference to get the pressure difference in pascals. The pascal is the standard unit of pressure for scientific applications. The acceleration due to gravity is the rate at which falling objects accelerate on Earth and equals 9.81 meters per second squared. Assume for the example the fluid is mercury which has a density of 13,600 kilograms per cubic meter. Completing the exercise leads to 13,600 kilograms per cubic meter times 9.81 meters per second squared times 0.10 m, or 13,341.6 pascals. 4.Convert the pressure to common units of pounds per square inch (psi), if desired, by dividing by 6,894.8, since each psi contains 6,894.8 pascals. Performing this step yields 13,341.6 pascals divided by 6,894.8 pascals per psi, or a pressure of 1.9 psi. |
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