* Mass is a fundamental property of an object that represents the amount of matter it contains. It is an intrinsic property and remains constant regardless of location.

* Weight is the force exerted on an object due to gravity. It is dependent on the mass of the object and the strength of the gravitational field.

Here's why:

* On Earth, we experience a constant gravitational force. This force pulls objects towards the center of the Earth, resulting in their weight.

* If you were to travel to the moon, where gravity is weaker, your weight would decrease even though your mass remains the same.

In summary:

* Mass: Intrinsic property, constant

* Weight: Force due to gravity, varies with location