What is the relationship between weight and mass? Which is an intrinsic, unchanging property of a body?

Weight, w = mg

Mass is an intrinsic property.

Explanation:

Mass is the measure of amount of matter in an object. It is an intrinsic that is unchanging property of a body. Mass cannot be destroyed nor be created.

Weight is the product of mass and acceleration due to gravity.

It changes with value of acceleration due to gravity. That is weight in Earth not equal to weight in moon since the value of acceleration due to gravity is different. So, weight is not an intrinsic property. It is a changing property for a body.

Weight, w = mg, where m is the mass and g is the acceleration due to gravity value.