Question

Which of the following statements is correct regarding the Leidenfrost effect?

A. Leidenfrost effect is observed when the surface temperature of the heating object results in nucleate boiling
B. Leidenfrost effect cannot be observed for water because it evaporates before the surface temperature of the heating object reaches the required characteristic value
C. Leidenfrost effect is characterized by droplets levitated by their own vapor layers on a sufficiently hot surface
D. All of the above statements are incorrect

Answer 1

The Leidenfrost effect occurs when droplets are levitated by their own vapor layers on a very hot surface, which is statement 'C'. Statements 'A' and 'B' are incorrect descriptions of the phenomenon.

Step-by-step explanation:

The correct statement regarding the Leidenfrost effect is 'C. Leidenfrost effect is characterized by droplets levitated by their own vapor layers on a sufficiently hot surface.' This phenomenon occurs when a liquid comes into contact with a mass significantly hotter than the liquid's boiling point, creating an insulating layer of vapor that prevents the liquid from boiling rapidly. Conversely, 'A' describes nucleate boiling, which is a different heat transfer process, and 'B' is incorrect because the Leidenfrost effect can indeed be observed with water when the surface temperature is high enough.