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I made ScienceFix.com to share my favorite demos that I do in my middle school science classes.  

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« Video Demo: Reaction Chamber | Main | Genetic Engineering in the Classroom »
Wednesday
Jul152009

Video Demo: Water Up

An inverted 100 ml beaker is placed inside a 400 ml beaker filled with colored water. The 400 ml beaker is placed on a hot plate. The water boils for a while, and then the beaker is removed. The water vapor inside cools condenses back into liquid. The molecules of a liquid take up less space than a gas, and therefore the pressure inside lowers. The atmospheric pressure pushes the colored water up inside the beaker. This demonstration can be found in Tik L. Liem’s Invitations to Science Inquiry.

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