Hydrostatics Definition and Laws

What is Hydrostatics

Hydrostatics Definition: The Branch of science which deals with the study of fluids at rest.

Read Also- Fluid Mechanics: Objective Questions

Pascal’s Law

  • It states that the pressure or intensity of pressure at a point in a fluid at rest is equal in all directions.
  • Let consider a fluid at rest in a closed container then a change in pressure at one point will be transmitted without loss to every point of the fluid and to the walls of the container.

Hydrostatic Law

  • The rate of increase of pressure in the vertical direction is equal to the weight density of the fluid at that point.

∫dp= ∫ρgdZ

Where p= pressure

Z= height from the surface

Pressure Measurement Terms

Absolute Pressure

  • Pressure measured with reference to absolute zero pressure.

Gauge Pressure

  • Pressure measured with reference to the atmospheric pressure.

Vacuum Pressure

  • The pressure is below the atmospheric pressure.

Read Also- Surface Tension & Capillary Action

Relationships between these Pressures

Pabs = Pgauge + Patm

Pvacuum = Patm – Pabs

Measurement of Pressure on a Fluid (devices)

  • MANOMETERS- Simple and Differential

Read More- Non-Newtonian Fluids

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