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Partial pressure is the pressure exerted within a mixture by an individual gas (such as the partial pressure of nitrogen gas in the air at sea level is 593 \ mmHg or 79058.76 \ Pa ).Absolute pressure is the pressure that exists in a space with no matter, such as in a perfect vacuum.The pressure formula (or pressure equation) is therefore Pressure is calculated by dividing the amount of force by the area. To calculate the pressure, area or force applied to an object, we need to use their intrinsic relationship. Weight is calculated by multiplying mass by the acceleration of gravity so heavier objects exert more pressure. Pressure is a measure of force per unit area. The water level is indicated on a scale on the side of the quadrant.The pressure formula is a formula connecting pressure, area and force. Water is added to the tank via a flexible tube and may be drained through a valve in the side of the tank. An indicator attached to the side of the tank shows when the balance arm is horizontal. Correct alignment is indicated on a circular spirit level mounted on the base of the tank. This assembly is mounted on top of an acrylic tank which may be levelled by adjusting screwed feet. The balance arm incorporates a hanger for the weights supplied and an adjustable counterbalance. This means that when the quadrant is immersed, the only force that gives rise to a moment about the knife edges is the hydrostatic force acting on the end face of the quadrant. The knife edges coincide with the centre of the arc of the quadrant. The Hydrostatic Pressure accessory has been designed to determine the static thrust exerted by a fluid on a submerged surface and enables comparison of the measured magnitude and position of this force with simple theory.Ī fabricated quadrant is mounted on a balance arm which pivots on knife edges.
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