Question

Which one of the following is not a form of condensation?
1. Dew
2. Fog
3. Frost
4. Sleet

Answer 1

Correct Answer - Option 4 : Sleet

The correct answer is Sleet.

• The conversion of water vapour into the water is called condensation.
• It is caused due to the loss of heat.
• The capacity to hold water vapour may saturate when the moist air is cooled and the extra water vapour then condenses.
• Condensation depends upon the relative humidity of the air and the amount of cooling.
• Precipitation consisting of small ice pellets formed by the freezing of raindrops or of melted snowflakes is called sleet.  
• Sleet is liquid water that freezes before it hits the ground. Hence it is not the form of condensation.

• Dew - Moisture condensed from the atmosphere, especially at night, and deposited in the form of small drops upon any cool surface. 
  •  Dew is the result of water changing from a vapor to a liquid. 
• Fog - When the temperature of an air mass containing a large quantity of water vapour suddenly falls down, condensation takes place within itself on fine dust particles.
  • Fog is a kind of cloud but is very close to the ground.
• Frost - Frost forms on cold surfaces when condensation takes place below freezing point (0° C).