In order to make liquid oxygen, oxygen needs to be changed from its gaseous form into a liquid, and this occurs at -183 degrees Fahrenheit. Use several cycles of cooling and compression to turn oxygen into a liquid withhelp from a science teacher and field biologist in this free video on chemistry. Expert: Brian Erickson Contact: Ericksontutoring.blogspot.com Bio: Brian Erickson is a tutor in math and science, as well as a field biologist. Filmmaker: Todd Green

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