Pressure, motion, heat, electricity. The invisible pushes and pulls, made visible.
The atmosphere presses on everything with about fifteen pounds per square inch. Take the air out of a can and watch.
Alcohol vapor in a big jug and one match. Gas laws, reaction rates, and balloons that get eaten.
Static that lifts foil, motors built from a battery and a wire, and magnets that push on copper.
Slinkies that hover, Newton's cradle with seven balls, and a pendulum that draws patterns in the air.
Water that stays liquid below freezing, drops that skate on a hot pan, and why metal feels colder than wood.
A paper cup that out-shouts a real speaker, and glass that vanishes in cooking oil.