#2 The Water Freeze

EXPERIMENT: 

Place a bowl of almost boiling water and a bowl of cold water in the freezer.  Which will freeze faster?

PREDICTION:
The cold water will freeze faster because it has a lower starting temperature.

OBSERVATION:

• After 30 mins there was no ice in either container.
• After 1 hour the cold water was starting to show signs of freezing.
• After 2 hours the cold water had more ice than the almost boiling water.

CONCLUSION:
Cold water freezes faster than hot water.

RESEARCH:
While reading about this topic I found that there are cases where hot water may actually freeze faster than cold water, but the conditions have to be just right.  If I had put the exact same amount of water in two identical pans then the hot water may have frozen faster.  This could be due to evaporation of the hot water.  As it cools it looses mass due to evaporation, allowing it to freeze faster because of the reduction in mass.