A low pressure system is like a giant funnel of wind spiralling inwards and upwards forcing warmish air in the centre to rise ...

frac{\text{force}}{\text{area}}\) The unit of force is a Newton (N). The unit of area is a square metre (m 2). The unit of pressure is a Pascal (Pa).

P = \frac{F}{A}\) The unit for pressure is the pascal (\(Pa\)). One pascal is equivalent to one newton per square metre. Atmospheric pressure is approximately \(1\times 10^{5} Pa = 100000 Pa\).