What is the difference between mass and weight?

As mentioned before mass is the amount of substance contained in an object and its unit is kilogram. Weight on the other hand is the gravitational pull that an object with mass experiences in the presence of gravity. It is the measure of gravitational force between the object and the earth. Therefore, its unit is same as the unit for force, which is Newton. When we say that a person has 60 kg, we are talking about the mass of his body since kg is the unit for mass. A person with 60 kg mass has a body weight of about 600 Newton.

If a body with some mass is not close to another massive body such as the Earth or the Moon, then that object will have mass but not any weight. This shows that any object with mass will have the same mass wherever the object is placed. However, depending on the location of the object, it can have different weights. For example, a person on the Moon will have only one sixth of the body weight that it has on the Earth.