Fluid Mechanics
Bed pressure drop in an air fluidised bed of catalyst particles (ρp = 200 kg/m³, Dp = 0.05 cm) of 60 cm bed depth and bed porosity of 0.5 expressed in cm of water (manometer) is

60
45
90
30

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Fluid Mechanics
A differential pressure cell is used for

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

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