Rehbinder effect demonstration - GIF

[Altair]

Rehbinder effect demonstration.




Previously:

Mixing water with different densities demonstration - video
Charles's law demonstration - GIF
Bernoulli's principle demonstration - GIF
Evaporative cooling demonstration - GIF
Newton's first law of motion demonstrated - GIF

[WmRMeyers]

I don't have enough unnecessary cups to experiment with, but I expect the cup is full of water when the nail is hammered through it? Quite a bit of what looks like chop on the water when he's hammering, and water is non-compressible, but transmits force. INTERESTING demonstration.

Bill

[mklotz]

I seem to remember a demonstration where glass was cut with scissors under water.

[nova_robotics]

I seem to remember a demonstration where glass was cut with scissors under water.

Huh. Well would you look at that.

[mklotz]

I seem to remember a demonstration where glass was cut with scissors under water.

Apparently my memory was accurate...

[BuffaloJohn]

From wiki:

The Rehbinder effect in physics is the reduction in the hardness and ductility of a material, particularly metals, by a surfactant film.

A proposed explanation for this effect is the disruption of surface oxide films, and the reduction of surface energy by surfactants.

The effect is of particular importance in machining, as lubricants reduce cutting forces.