Question: What is the process of a liquid changing into a gas at any temperature below its boiling point?
Answer: Evaporation
Explanation: Evaporation occurs when liquid particles gain energy and escape into the air as gas.
Question: What happens to the rate of evaporation when temperature increases?
Answer: Increases
Explanation: Higher temperature provides more energy to liquid particles, increasing their movement and speeding up evaporation.
Question: What happens to the rate of evaporation when humidity is high?
Answer: Decreases
Explanation: High humidity reduces the rate of evaporation as the air is already saturated with water vapor.
Question: What factor increases evaporation by moving away the water vapor formed?
Answer: Wind
Explanation: Wind speeds up evaporation by removing the layer of water vapor from the surface.
Question: What is the cooling effect caused by evaporation called?
Answer: Latent heat
Explanation: Evaporation absorbs heat from the surroundings, causing a cooling effect.
Question: Why do clothes dry faster on a hot day?
Answer: Temperature
Explanation: Higher temperatures increase the rate of evaporation, making water molecules escape faster.
Question: Why do we feel cold after applying alcohol or perfume on our skin?
Answer: Evaporation
Explanation: Alcohol and perfume evaporate quickly, absorbing heat from the skin and creating a cooling effect.
Question: What happens to the rate of evaporation when the surface area is increased?
Answer: Increases
Explanation: A larger surface area allows more particles to escape, speeding up evaporation.
Question: Why does sweating help in cooling the body?
Answer: Heat absorption
Explanation: Sweat evaporates by absorbing body heat, which helps in cooling down.
Question: What is the process opposite to evaporation?
Answer: Condensation
Explanation: Condensation occurs when gas particles lose energy and turn back into liquid
