March 18, 2009

Today's Observation:
tears are warm, really warm, hot almost.

Today's Question:
Do human tears freeze?

Google's Reply:
Yes, but in less temperature than pure water according to equation below:
dt = K * M in this equation dt is change in freezing temperature relative to pure water(t freezing for tear - t freezing for pure water in our case), K is constant for water and M is molal concentration of solution (in our case tears)! suppose K=1.85 and also suppose tear molal concentration is 1! so dt would be 1.85 that is tear will freeze in -1.85 degree celcious! so what is pure water freezing point? of course it is 0 degree!

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