Reuben Hudson, Henry M. Ackerman, Lindsay K. Gallo, Addison S. Gwinner, Anna Krauss, John D. Sears, Alexandra Bishop, Kristin N. Esdale, Jeffrey L. Katz
A quick demonstration is described to showcase the use of CO2 as an alternative, benign dry cleaning solvent. The demonstration includes visible evidence of CO2 as a solid, a liquid, and a gas, making it ideal as part of a broader lesson on states of matter. The demonstration relies on a technique for generating liquid CO2 in a centrifuge tube, which has been used for extractions in undergraduate teaching laboratories for over a decade. This report represents a unique attempt to transfer this method to the K–8 curriculum.
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