Fluid Mechanics

#### Hydrostatic Pressure

• If an object is placed in a fluid, the fluid pressure will act upon the entire surface of the area at right angles.
• This is given by the general formula for stress:
(1)
\begin{align} \delta = \frac{F}{A} \end{align}

Where:

• $\delta$ is the Pressure (Pa)
• F is the force (N)
• A is the area ($m^{2}$)

Also, the deeper an object is put, the higher the pressure.

• This is given by:
(2)
$$P = P_{0} + pgh$$

Where:

• P is pressure at depth h (Pa)
• $P_{0}$ is the pressure at the top (Pa)
• p is the density of the fluid ($kg/m^3$)
• g is the gravitational acceleration $m/s^2$
• h is the depth below the top (m)
• Neoprene is a suitable material for the hydraulic stoppers as it is resistant to grease and oil. It is also sufficiently flexible to make a good seal under pressure.
page revision: 2, last edited: 21 Jun 2011 07:54