Question

When liquid nitrogen is poured onto the hand, it slips away without affecting the hand actually. What is this phenomenon called?

(a) Kaye effect

(b) Kinetic isotope effect

(c) Kondo effect

(d) Leiden frost effect

The question was posed to me in quiz.

The question is from P-Block Elements topic in portion P-Block Elements of Chemistry – Class 12

Answer 1

The correct choice is (d) Leiden frost effect

To elaborate: The Leiden frost effect creates a small layer of insulating vapor layer just at the instant when the liquid particle strikes a surface comparatively a lot hotter than liquid. Liquid nitrogen is at              -196°C and the human body at 38°C. This insulating vapor layer prevents the liquid to further come in contact with the body which then slips away.