Fluid Mechanics
Multistage compressors are used in industry, because they

Are easy to control
Resemble closely to isothermal compression
Reduce the cost of compressor
Reduce the size requirement

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Fluid Mechanics
A differential pressure cell is used for

Measuring small pressure difference in gases
Remote recording of pressure difference
Measuring the difference of the impact & the static pressure
Measuring small pressure difference in liquids

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