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.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.