By the study of fluid at rest it can be understand that

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Hydrogen is compressible fluid

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the simplest pressure gauge is the sphygmomanometer

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surface tension is the force in the surface acting normally per unit length across any line in the surface of a liquid

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according to Archimedes' Principle the buoyant upward force can be greater than the weight of floating body

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the inside pressure is less than the outside pressure of a soup bubble

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