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Mar
16
comment Will the hole on a metal disc expand or contract upon heating?
Thanks for all your explanation!!
Mar
15
comment Will the hole on a metal disc expand or contract upon heating?
makes sense.. in case, if the heating is concentrated just around the hole, then will the hole shrink?
Mar
15
comment Will a hole cut into a metal disk expand or shrink when the disc is heated?
Consider the disc made of isotropic material is heated uniformly across its area... the metal near the outer circumference, tries to expand outward because of resistance from its disk-side neighboring molecules. Similarly, the part that is near the inner circumference of the hole (cut-out part) tend to expand to its free side, and thereby covering up the hole
Mar
15
comment Will the hole on a metal disc expand or contract upon heating?
@Manishearth, Consider the disc is heated uniformly across its area... the metal near the outer circumference, tries to expand outward because of resistance from its disk-side neighboring molecules. Similarly, the part that is near the inner circumference of the hole (cut-out part) tend to expand to its free side, and thereby covering up the hole. \
Mar
15
comment Will the hole on a metal disc expand or contract upon heating?
@EnergyNumbers, the two cases, a) the smaller Disc is cut out and b) embedded in to the bigger disc, are different. In the first case, there is no resistance whatsoever for the Disc D1 to expand inward and thereby shrinking the hole....
Mar
15
comment Will the hole on a metal disc expand or contract upon heating?
@Manishearth, Thank you for the explanation.. But I think there is a difference in the 2 cases, you mentioned... first when the metal piece is still in the disk, and the second - the metal piece is removed to make it a disk.. in the latter case, there is no resistance for expansion inwards... so, there is a possibility of hole shrinking...