Fluid Mechanics
The terminal velocity of a solid spherical particle falling through a stationary fluid mass in the Stoke's law range is proportional to the

Inverse of fluid viscosity
Square of particle size
Difference in the densities of the particle & fluid
All of these

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Fluid Mechanics
A differential pressure cell is used for

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

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