Monday, May 25, 2015

The physics of floating screwdrivers

I explain how a jet of air can float a common screwdriver.

Plans to make your own fluid turbulence disc:

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Nighthawkinlight's video about floating screwdrivers:

Wednesday, May 6, 2015

Shrinking paper money with ammonia

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As a follow-up to my previous video on bending wood, I show how ammonia can shrink paper money.  The money is dipped into liquid anhydrous ammonia, then dried, and the process is repeated about a dozen times.  As the money dries, it shrinks due to the surface tension of the boiling/evaporating ammonia.

Video on bending wood:
Making aerogel: