Fluid Mechanics

# Basics of Hydro-Statics

## HYDRO-STATICS ?

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

### 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 fluid and to the walls of the container.

### Hydro-static Law

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

∫dp= ∫ρgdZ

Where p= pressure

Z= height from 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

• Pressure which is below the atmospheric pressure.

### Relationships between these different pressures

Pabs = Pgauge + Patm

Pvacuum = Patm – Pabs

MEASUREMENT OF PRESSURE ON A FLUID (DEVICES)

• MANOMETERS- Simple and Differential
• MECHANICAL GAUGES

0 Shares
Share
Tweet
+1
Share
Pin
Stumble