Like the water in the vacuum chamber, less pressure lowers the boiling point. The kids will remember the astonishing announcement of water existing on the Moon and Mars. You've just shown them that water boils in a vacuum. Your big gulp will boil away on the surface of the moon because it's a vacuum. To prove it I sometimes put some ice cubes in the vacuum chamber and they sit there without changing.
Frozen water is the form they have discovered on the surface of the Moon and Mars.
Yep, your blood would boil away as it hit the surface of the cut. Index of Activities . This activity is featured in Future Flight Hawaii , a K-12 Education Project of Hawaii Space Grant Consortium. FEB 27 2001.