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questions concerning measurements, experiments, and activities that demonstrate physics and are safe to do at home, require at most one tool or ingredient not readily available, and can be interpreted or analyzed on one sheet of paper with accessible math.
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A simple way to make liquid oxygen at home
If you're freezer won't get the bottle cold enough, try and put the bottle or whatever container you are using inside a bigger container, fill it with ice and rock salt. That will lower the temperatur …