Question

Which quantity remains constant and does not change from place to place?

Answer 1

One can have many like mass,difference between any 2 points, gravitational constant,

Answer 2

The law of conservation of mass or standard of mass conservation states that for any system closed to all transfers of energy and matter,

the mass of the system must remain stable over time,

as system's mass cannot change,

so quantity cannot be added nor removed.

Hence, the quantity of mass is preserved over time.