It is measured by a beam balance or a physical in kg.It is same every where.If your mass is 30kg,it will be 30kg on the moon or any part of the earth as well.Weight is the force with which a heavenly body pulls a body towards its center.It is measured in newton.It is different places and heavenly bodies.Weight depends on pull of gravity.If the gravity is less,weight is less,If the gravity is more ,weight is more.
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