The most important thing you need to know: in order for pressure to exist, you need a confined space.
Scientists and engineers refer to a confined space as a container from which liquids or gases are completely unable to escape or enter. When such a confined space is squeezed, it exerts a pressure that affects liquids and gases equally in all directions.
A balloon is a perfect example of such a space – it expands equally in all directions when blown up.
Pressure is calculated using the formula: P = F/S. What do these letters mean?
F – the force applied to the liquid or gas
S – the area of the closed space
P – the resulting pressure, measured in Pascals
So, the greater the force, the greater the pressure. The larger the area, the smaller the pressure.
