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Article: Liquid motion: how does heat affect a material's density?(hands-on)

Article from:
SuperScience
Article date:
February 1, 2008
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THINK: How does a hot-air balloon move?

PREDICT: Whether a material rises or sinks depends on its density, or a measure of the amount of mass in a given volume. A material with a lower density will rise above a higher-density material. How does the temperature of water affect its density?

You'll Need

* newspaper

* 2-liter soda bottle with the top cut off

* plain cold tap water

* warm tap water, dyed red**

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