Attention Getting Question: Would the mass and weight of your body be the same on the moon as it is on Earth? To answer that question, we must learn more about mass and weight. Introduction: What are Mass and Weight? Mass is one of the properties of matter that can be measured. Mass is the amount of matter in a substance. Weight is another property of matter that can be measured. Weight is a measure of the force or pull of gravity between two masses. Since we live on Earth, gravity on Eart