You need to put a metal rod
into a hole in a metal cylinder.
It is too tight. Which would
be the best strategy to make
the rod fit? (use cooling and/or heating)
-- Put the rod into the freezer for a while. As it cools, it contracts (gets smaller) slightly.
-- Put the cylinder into hot hot water for a while. As it heats, it expands (gets bigger) slightly.
-- Bring the rod and the cylinder togther quickly, before the rod has a chance to warm up or the cylinder has a chance to cool off.
-- I bet it'll fit now.
-- But be careful . . . get the rod exactly where you want it as fast as you can. Once both pieces come back to the same temperature, and the rod expands a little and the cylinder contracts a little, the fit will be so tight that you'll probably never get them apart again, or even move the rod.
