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State for each of the following whether it is due to evaporation or condensation:
(a) Water drops appear on the outer surface of a glass containing cold water.
(b) Steam rising from wet clothes while they are ironed.
(c) Fog appearing on a cold winter morning.
(d) Blackboard dries up after wiping it.
(e) Steam rising from a hot girdle when water is sprinkled on it.
(a) Water drops appear on the outer surface of a glass containing cold water - condensation.
(b) Steam rising from wet clothes while they are ironed - evaporation.
(c) Fog appearing on a cold winter morning - condensation.
(d) Blackboard dries up after wiping it - evaporation.
(e) Steam rising from a hot girdle when water is sprinkled on it - evaporation.
[Extra information: The process of changing water into its vapor is called evaporation.
The various factors that affect evaporation are:
1. Temperature: The rate of evaporation increases with the increasing temperature. The rate of evaporation and temperature are proportional to each other.
2. Surface area: The rate of evaporation increases with the increased surface area. The rate of evaporation and surface area are proportional to each other.
3. Humidity: The rate of evaporation decreases with an increase in humidity. The rate of evaporation and humidity are inversely proportional to each other.
4. Wind speed: The rate of evaporation increases with the wind speed. The rate of evaporation and wind speed are proportional to each other.
The process of changing water vapour into water is called condensation.]
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