Measuring Atmospheric Pressure with a Barometer

A barometer is an instrument used to measure atmospheric pressure, which is the force exerted by the weight of the air above us. The pressure is usually expressed in units like millimeters of mercury (mmHg), pascals (Pa), or inches of mercury (inHg). There are two main types of barometers: mercury barometers and aneroid barometers. The

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Absolute Pressure of a Vacuum chamber

The absolute pressure of a vacuum chamber refers to the total pressure inside the chamber, including both the pressure exerted by the air (or gas) inside the chamber and the atmospheric pressure outside it. Absolute pressure is measured relative to a perfect vacuum, meaning it includes the atmospheric pressure as part of the reading. In

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pressure ratio, mach number, velocity,density,speed of sound,mach number

Problem statement: Compressed air at 40 ∘C and 145 kPa from a large tank is discharged to ambient atmosphere at 101 kPa, through a convergent nozzle of 10 cm2 exit area, Calculate the mass flow rate through the nozzle when the ambient atmosphere is at (a) 101 kPa, (b) 50 kPa, and (c) 30 kPa.

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