PacSci-Doku: "Levitation Magic" Answer
By Dennis Schatz - Senior Vice President for Strategic Programs
The question in this edition is:
What will allow scientists to mix solutions in midair?
The answer: Sound Wave
Scroll down to see the solution.
The power of sound waves will allow scientists to keep drops of chemical solutions levitated in midair, so that the solutions can be mixed without contamination from touching the sides of a container. Sound waves don't seem that powerful, but they actually exert a slight pressure. If the sound is loud enough, the pressure can keep drops of a solution suspended. It takes a very loud sound, louder than the sound you'd hear when standing next to a jet engine during takeoff -- a sound that would rupture your eardrums if you didn't wear ear protection. But the scientists don't need earplugs because the pitch of sound used to produce the levitation is higher than the human can hear. The most likely use for this sonic levitation is in the pharmaceutical industry, where drugs can be mixed without being contaminated by the sides of the container.
Here is the solution:
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