# Basic Laws of Fluid Mechanics (Basic Concept of Fluid Mechanics Part-1)

## Hydrostatic’s Law

##### According to this law, the rate of increase in pressure in a vertical direction is equal to the weight density of the fluid at that point.

Now integrating the above expression from z = 0 to z = h  then pressure at depth h is given by

### Now let’s discuss few cases to measure the gauge pressure.

#### 1. We want to find the pressure at point B in the following figure:

As we have discussed above that pressure at C will be given by Hydrostatic law

Pc = ρgh

and by pascal’s law Pressure at any point in same level will be same i.e.

Pb = Pc = ρgh

#### 2. We want to find the pressure at point B in the following figure:

By pascals law pressure will be same along A-A’  line.

Now applying hydrostatic law we can write

#### 3. We want to find the pressure between points A& B in the following figure:

By pascals law pressure will be same along C-C’  line.

Now applying hydrostatic law we can write

#### 4. We want to find the pressure at point B in the following figure:

By pascals law pressure will be same along C-C’  line.

Now applying hydrostatic law we can write

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