27
$\begingroup$

I recently read that:

A drop of water landing on a hot plate at 150°C (300°F) evaporates in a few seconds. A drop of water landing on a hot plate at 200°C (400°F) survives a whole minute.

How would you explain this observation using physics principles?

$\endgroup$
40
$\begingroup$

That is the Leidenfrost effect.

If the surface is hot enough, a layer of vapor exists between the hot surface and the droplet, insulating the droplet from the full heat.

The droplet levitates above the hot surface.

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.