**Hydrostatics Fluid Mechanics Notes**

Contents

**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__

__Relationships between these Pressures__P_{abs} = P_{gauge} + P_{atm}

P_{vacuum} = P_{atm} – P_{abs}

**Measurement of Pressure on a Fluid (devices)**

**MANOMETERS-**Simple and Differential**MECHANICAL GAUGES**

**Read More-** **Non-Newtonian Fluids**