Question

what is the difference btw weight and mass

Answer 1

Weight is the gravitational force applied on any object by the earth.Weight is variable
Mass is the amount of matter contained in any object.Mass can never be zero,It is fixed.

Answer 2

There is a basic difference, because mass is the actual amount of material contained in a body and is measured in kg, gm, etc. Whereas weight is the force exerted by the gravity on that object mg. Note that mass is independent of everything but weight is different on the earth, moon, etc.