Re: Cracked Block, Continued

Posted by Gary_N_WV on February 03, 2004 at 12:01:08 from (129.71.207.144):

In Reply to: Cracked Block, Continued posted by Allan on February 03, 2004 at 10:17:11:

Freezing liquids causes heat!
When I was a small boy about 7 or 8 years old, it was my job to walk about a mile every evening to pick up milk from a neighboring farm after school.
The farmer put the milk in gallon jugs that was sealed with a cardboard lid that was pressed down in the top of the jar and sat the jugs outside on a porch.
Being a kid, sometimes I was quite late getting to his house for the milk.

I can remember several times that the milk froze, pushing the cardboard lid out and the milk would expand into a column of about 2 or 3 inches high and the diameter of the jug opening. Kinda of a neat thing to a kid to see this column of milk sticking out the top of the jug.
Later on, the farmer started putting the milk in jugs with a lid that screwed on tight………I always thought that he didn’t know what he was doing because the jugs froze and busted then.
In the first case above, the cardboard stopper moved and allowed the pressure of the freezing milk to escape, in the second case, the glass of the jug gave.
I might point out that in neither case did the temperature ever get above freezing.
As for the heat produced by this freezing process, it was very readily felt on the seat of my pants when my father got home from work and discovered I had let the milk freeze and the jugs break!

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