Answer:
(A) Because of the high humidity levels in coastal areas, water coolers are ineffective there. The air is more humid in coastal regions, which slows the pace of evaporation. Water is evaporated in water coolers, which cools the air. However, the air is already moist in humid regions, making it harder for water to efficiently evaporate. Water coolers hence do not significantly cool coastal areas.
(b) Temperature and humidity are the two key variables that affect how quickly water evaporates.
1. Temperature: Evaporation happens more quickly at higher temperatures. As the temperature rises, the water molecules become more energetic and are able to separate off the liquid surface and reach the atmosphere as vapor.This technique hastens the evaporation process.
2. Humidity: The amount of moisture in the air is referred to as humidity. It is more difficult for water to evaporate in environments with higher relative humidity since the air is already saturated with moisture. Because there is less space for new water vapor in the air when it is humid, the rate of evaporation drops.
In conclusion, humidity and temperature affect how quickly water evaporates. While higher humidity slows evaporation, higher temperatures encourage faster evaporation.
In response to the query regarding placing small amounts of water and ether on the palms of both hands, ether will cool more than water. This is so because ether and water have different boiling points.
The cooling effect is stronger when a liquid with a lower boiling point evaporates because it absorbs more heat from its surroundings, including the hand.