Salt water is anti-freeze... right?

Here's a pic of intravenous "fluid" on one of my retrievals not near the equator.
Little did I know that normal saline can indeed freeze ... and so can sodium lactate!
Apparently the ambient temp of -23C (in the day!) was indeed too much for these bottles. Thankfully fluid wasn't required this time.
There you go - a once useless fact that now isn't.

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