P=F/A

There is one thing called pressure,
they define it as the total force exerted to an object, divide by the effective area of that object, which, in contact with another place where the pressure is applied on.

Symbol of pressure is P, formula is as below
P=F/A
with F=force, in unit of N(Newton)
A=area, unit of squared meter

The unit of pressure is N/squared meter, or in another form, Pa(Pascal)

This explains the "cold" joke posted few days before, for those who don't know Physics.

Pressure exists everywhere, and sometimes it's important,
for example, an everyday application, without pressure, we won't be able to suck water through straw.


Sometimes, pressure is not only used with the unit of Pa,
it is sometimes called,
STRESS.