Pressure on solid
Pressure is the amount of force acting per unit area. Its unit used
for measurement of pressure is Pascal (Pa). The formula is as follow,
Pressure = Force / Area
P = F / A
where P is measured in Pascal, Pa; F is measured in
Newton, N; A is measured in Square Metre, mē.
From the formula above, we can see that the smaller the
area, the higher the pressure. This is how by sharpening the knife and
thus reducing the area of the sharp edge could make it easier for us to
cut with though applying the same amount of force on an object.
Pressure on liquid
Pressure in liquid or atmospheric pressure are as well
measured in Pascal (Pa). Pressure in this form can be measured using
barameter and manometer. However, the formula differs. It is calculated
base on the following formula,
Pressure = h X p X g
where h is the height measured in metre (m); p is
the density of the liquid measured in kg/m3; g is the
gravitational acceleration of freefall measured in m/sē