A brass disc fits tightly in a hole in a steel plate.Would you heat or cool system to loosen the disc from the hole?

A brass disc fits tightly in a hole in a steel plate.Would you heat or

1.	A brass disc fits tightly in a hole in a steel plate.Would you heat or cool system to loosen the disc from the hole?
Answer» Solution :Coefficient of linear expansion of BRASS is GREATER than that of steel.So the system SHALL be cooled to LOOSEN the DISC from the hole.