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प्रश्न
Give reason.
A dry handkerchief gets wet at once on dipping in water, but it takes longer for a wet handkerchief to dry.
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उत्तर
A dry handkerchief gets wet at once because it quickly absorbs the water in which it is dipped. However, it takes longer for a wet handkerchief to dry because the water needs to evaporate from the handkerchief. Evaporation is a slow process that is dependent on other factors as well, like relative humidity.
संबंधित प्रश्न
State whether the following is physical or chemical changes.
Boiling of an egg —
Tick (√) the correct alternative from the choice given for the following statement
When sugar is heated, its colour changes into
True or false?
During a physical change energy is either given out or absorbed by the system.
Fill in the blank
An earthquake is a _______ change.
What role does energy play in initiating a chemical change ?
Distinguish between the following.
Periodic change and non-periodic change
Under which different types can the following changes be classified?
Bursting of a cracker.
Explain in brief the involvement of energy in physical and chemical changes.
How can a change occur in a substance?
The difference between initial state and the final state is called change.
