Question

Explain ladien frost effect

Answer 1

The Leidenfrost effect is a physicalphenomenon in which a liquid, in near contact with a mass significantly hotter than the liquid's boiling point, produces an insulatingvapor layer keeping that liquid from boilingrapidly. Because of this 'repulsive force', a droplet hovers over the surface rather than making physical contact with it. This is most commonly seen when cooking: one sprinkles drops of water in a pan to gauge its temperature: if the pan's temperature is at or above the Leidenfrost point, the water skittersacross the pan and takes longer to evaporate than in a pan below the temperature of the Leidenfrost point (but still above boiling temperature).

The effect is also responsible for the ability of liquid nitrogen to skitter across floors.

It has also been used in some potentially dangerous demonstrations, such as dipping a wet finger in molten lead or blowing out a mouthful of liquid nitrogen, both enacted without injury to the demonstrator.The latter is potentially lethal, particularly should one accidentally swallow the liquid nitrogen.