4B20 Convection

Turbine Rotator

Turbine Rotator

Catalog: 
4B20.381
Location: 
Bd4
A small turbine rotator turns when placed above a heat source.

Amazing Ice Melting Blocks

An ice cube is placed on each block.

Amazing Ice Melting Blocks

Catalog: 
4B20.230
Location: 
Bd4
Two blocks appear identical. To the touch one feels colder than the other yet both are at room temperature. An ice cube is placed on each and one melts much faster than the other.

Convection chimney (lamp)

Air heated by a lamp turns the carousel by convection. Room lights on.

Convection chimney (lamp)

Catalog: 
4B20.25
Location: 
Be3
Air heated by a light bulb, rises and turns the vanes atop the lamp.