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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.
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
What do you observe when :
a spoon of sugar is heated in a pan
Fill in the blank
Burning of fuel is a _______ change.
State whether the following is physical or chemical changes.
burning of wood -
State whether the following is physical or chemical changes.
Melting of wax —
True or false?
In a chemical change, rearrangement of molecules and atoms involves some energy changes.
Fill in the blank
An earthquake is a _______ change.
Under which different types can the following changes be classified?
Bursting of a cracker.
Under which different types can the following changes be classified?
Occurrence of an earthquake.
How can a change occur in a substance?
Paper, LPG, CNG petrol, etc, are ______ substances.
