Pressures acts normal to the surface of any element, hence regarded as a scalar quantity. Pressure is a scalar quantity with no direction since each quantity relates to the quantity of pressure delivered. Pressure remains constant as the direction of the force applied to an element changes. Pressure travels both in liquid, gases and fluid hence its SI units are Pascal. It is useful when measuring volume in thermodynamics parameters hence it has a wide range of measuring the energy stored like atmospheric pressure. We measure body pressure using mercury.
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