Resumen de CO2 Dry Cleaning: A Benign Solvent Demonstration Accessible to K–8 Audiences

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.