Question

In which of the following condition does the evaporation of water takes place ?

• A. Only at 100°C
• B. Only above 100°C
• C. At all temperatures
• D. Only below 100°C

Answer 1

Answer:

C. At all temperatures

Evaporation is a surface phenomenon where liquid molecules turn into a gas. It occurs when molecules near the surface gain enough kinetic energy to overcome the attractive forces holding them in the liquid state. This process happens continuously at the surface of a liquid, even when the bulk temperature of the liquid is well below its boiling point.

• Boiling is different; it's a bulk phenomenon that occurs only at the specific boiling point (e.g., 100∘C for water at standard atmospheric pressure) when the vapor pressure equals the surrounding atmospheric pressure.