10TH GRADE · HYDROSTATICS

Pressure in liquids and gases

Force pressure, atmospheric and hydrostatic pressure.

18 minutes9 theory cards

LESSON MATERIAL

Basic Concepts

The pressure of a fluid at rest created by the weight of the layers above.

The deeper the point and the denser the liquid, the greater the pressure; at the same depth in a fluid at rest it is the same.

LESSON MATERIAL

p

Normal force per unit area.

Unit: pascal · $\mathrm{Pa}$

p_0

Accepted reference value of atmospheric pressure.

Unit: pascal · $\mathrm{Pa}$

LESSON MATERIAL

p=\frac{F}{S}

Pressure is equal to the force perpendicular to the surface divided by the area.

1\,\mathrm{Pa}=1\,\frac{\mathrm{N}}{\mathrm{m}^2}

One pascal is equal to one newton per square meter.

1\,\frac{\mathrm{N}}{\mathrm{sm}^2}=10^4\,\mathrm{Pa}

One newton per square centimeter is equal to ten thousand pascals.

1\,\mathrm{atm}\approx10^5\,\mathrm{Pa}

One atmosphere is approximately equal to one hundred thousand pascals.

p_0=101325\,\mathrm{Pa}

Normal atmospheric pressure is one hundred one thousand three hundred twenty-five pascals.

p=\rho gh

The pressure of a liquid column depends on the density, depth and acceleration of gravity.