## 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

Pabs = Pgauge + Patm

Pvacuum = Patm – Pabs

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

• MANOMETERS- Simple and Differential
• MECHANICAL GAUGES