Inertia is a property of matter by which it remains at the state of rest or in uniform motion in the same straight line unless acted upon by some external force.
Inertial is the effect of mass.
Measurement of inertia
Mass is a quantitative measure of a body’s inertia.
Mass is the amount of matter present in a body.
inertia is proportional to mass. If mass increases, then inertial will increase.
If we have an idea about the mass of a body, then inertia can be measured.