22. List the factors affecting evaporation.
23. Why is water sprinkled on a roof during a hot summer day?
24. Why does evaporation cause cooling?
25. Why do naphthalene balls disappear when kept in air for some days?
26. Why do wet clothes do not dry easily on a rainy day?
27. Compare evaporation and boiling.
28. Tabulate the properties of solid, liquid and
Answers
Answer:
22.The factors that affect the rate of evaporation of liquids are temperature, surface area, wind speed, and humidity.
23.On a hot summer day, when we sprinkle water on the roof or open ground, it evaporates quickly because of the heat of the sun.
24.It is because the water molecules absorb the heat of our body and convert into gas molecules. The heat lost from our skin makes us feel cooler.
25.Naphthalene undergoes sublimation easily.
26.In a rainy day, the humidity level in the atmosphere is already high.
27.Evaporation is slower, occurs only from the surface of the liquid, does not produce bubbles, and leads to cooling.
Boiling is faster, can occur throughout the liquid, produces lots of bubbles, and does not result in cooling.
28.Solids have a definite shape and volume. Liquids have a definite volume. Gases have no definite volume.
Explanation:
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