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By the amount of force acting on a surface. If you place a sheet of paper that is 1" by 1"(that is, one square inch) between you and a high pressure source you can measure how hard the pressure pushes on the paper. If it presses with the weight of 3 lbs, then the high pressure is 3psi(pounds per square inch) higher than the pressure around you. For low pressure the weight is negative.

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