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Old May 6, 2012, 09:21 AM   #19
Mike Irwin
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Join Date: April 13, 2000
Location: Northern Virginia
Posts: 35,250
I don't buy that hog. The metal around the void would contract away from the center point of the cold effectively making it larger.

A simple test would be easy. Take a piece of mild steel and drill a shallow hole in it say 3/32 of an inch.

Measure the hole with a caliper.

Then throw it in the freezer for a day and measure again.

Then allow the piece to come back to room temp. Measure it again as a control, then throw it in a 300few deg. Oven for a couple of hours and then measure the pore again.
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