$$P = \frac{F}{A}$$
Unit: Pascal - $N\cdot m^{-2}$

Solids

Examples

  1. Increase the pressure by Reducing the area
    • knife, needle
  2. Reduce the pressure by increasing the area
    • skis, wall foundations

Gases

$a.t.m.$ -> atmosphere pressure 100kPa
When goes up:

Smaller column of air above us
Air will be less dense

Liquids

$$P = \rho gh$$
ressure at the same depth acts equally in all directions

Floating force: difference of pressure

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