Question

why does mass remain constant but weight changes from place to place on
earth?​

Answer 1

Answer:

While the weight of an object varies in proportion to the strength of the gravitational field, its mass is constant, as long as no energy or matter is added to the object. For example, although a satellite in orbit (essentially a free-fall) is "weightless", it still retains its mass and inertia.

Answer 2

Answer:

Because Weight = mg

Therefore it depends on the acceleration due to gravity which changes from place to place on earth.