Can water explode if heated in the microwave?

	Project title: Can water explode if heated in the microwave?
Difficulty level:	Elementary school
Main link:	None

Hypothesis:

Most people heat water in the microwave when makeing things like hot chocolate and instant coffee, without ever haveing any difficulty. I don't believe it will explode.

Materials:

2 clean cups
tap water
distilled water
microwave
sugar cube or tea bag

The Procedure:

Fill one cup with tap water, and the other with distilled water. Place in microwave and heat until tap water boils, distilled water will not boil, because the impurities have been removed. Remove cups of hot water using extreme caution, then place a sugar cube in both cups.

Results:

The tap water should not be effected because of the impurities in the water caused it to just boil, then release steam, but the distilled water did not boil, but rather "super heated" and built up pressure, when the distilled super heated water is disturbed it should cause an "explosion." Very dangerous, expecially since we live in the day of bottled water.