What do you mean by physical quantity

Is mean something the you can measure with lenght weight time of fall

A physical quantity is something which can be measured and whose measurement is necessary because all the laws of physics are given in terms of these physical quantities. The examples of physical quantity are mass, length, time, temperature, electric current, velocity, acceleration, force, work, weight, power, energy etc.

There are some quantities which cannot be measured and hence are not classified as physical quantities, for example, love, honesty, hatred etc

Thus a physical quantity is a quantity which can be measured.