MP Board · Class 9 · Science · Matter in Our SurroundingsWhy does a desert cooler cool better on a hot, dry day?
Step-by-Step Solution
A desert cooler cools better on a hot, dry day because the rate of evaporation depends directly on temperature and humidity. On a hot dry day, the temperature is high and the humidity (moisture in the air) is low. High temperature and low humidity both increase the rate of evaporation of water, leading to a much greater cooling effect.
💡 Study Guide: This question tests core syllabus concepts from Matter in Our Surroundings. For formulas, key summaries, and mock exam reference guides, read the full Matter in Our Surroundings Revision Notes.