Exploring Our Fluid Earth

Teaching Science as Inquiry

 

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Has anyone tried this yet?

I am worried about the logistics of keeping water hot/warm and especially about keeping the cold water cold. I have no refrigerator. Also, if I get the bags ready ahead of time, do I have to keep them warm/cold overnight? Will they change? Thanks!

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Activity: Density Bags
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kanesa

Tue, 09/25/2012 - 20:27

In the TSI workshops, for cold water we use ice baths (ice in large Tupperware with plastic 'beakers" of water inside the bath). We either bring ice from home or buy a bag at the store. For hot, we heat in a kettle or microwave, but you can also use a hot plate. Coolers work well to keep hot hot and cold cold, and you don't have to keep the bags "at temperature" overnight; you can cool and heat them right before the activity.

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Exploring Our Fluid Earth, a product of the Curriculum Research & Development Group (CRDG), College of Education. University of Hawaii, 2011. This document may be freely reproduced and distributed for non-profit educational purposes.