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Which of the following statements are “true”?
(a) Water vapour is present in air only during the monsoon.
(b) Water evaporates into air from oceans, rivers and lakes but not from the soil.
(c) The process of water changing into its vapour is called evaporation.
(d) The evaporation of water takes place only in sunlight.
(e) Water vapour condenses to form tiny droplets of water in the upper layers of air where it is cooler.
(a) Water vapour is present in air only during the monsoon- False
There is always a small amount of water vapour present in the air.
(b) Water evaporates into air from oceans, rivers and lakes but not from the soil- False
Water also evaporates from the soil.
(c) The process of water changing into its vapour is called evaporation- True
(d) The evaporation of water takes place only in sunlight- False
Evaporation occurs when heat is present be it sunlight or fire (when a pot of water is kept for boiling on a stove.)
(e) Water vapour condenses to form tiny droplets of water in the upper layers of air where it is cooler- True.
[Extra information: The process of changing of water into its vapour 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.]
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