Generally, we use the same units for mass and weight, but they are not the same thing at all. Weight is the attraction of an object to a gravity field, and it is proportional to mass. We define mass in terms of weight on Earth. So you would weigh the same on earth anywhere you go because that’s how much you weigh on Earth, using scales created on Earth. If you move to the moon, your mass doesn’t change, but the local gravity field drops from 9.8meters per second squared to 1.6 meters per second squared. So your weight would be 10.8 Kg. Therefore if you travelled with Elon Musk to the moon you would weigh approximately 10.8 Kg as told by Nida Fathima .