A Wierd Demonstration of Sound Energy!
As you saw in the vintage video about sound and waveforms, sound is conveyed by pressure waves in the air, produced by some vibrating source and reaching our ears where it causes the ear drum to move--and the movement there generates signals to our brains. Very loud levels of sound carry so much energy that they can damage the structures in human ears. Here is a demonstration of sound energy and its effect on a common substance (cornstarch and water) which has some very unique properties as a "non-Newtonian" fluid--a slushy subtance that normally acts like liquid but under pressure acts more like a solid. This demonstration produces some very wierd effects just using sound energy. The "mush" is placed into an ordinary loudspeaker and a sound at 30 Hz (kind of a very low rumble) is played by the speaker. Everything that the cornstarch mush does here happens because of the sound energy that is being pushed into it--it is NOT alive even though it looks like aliens.