Advertisements
Advertisements
Question
If the back of your hand is moistened with alcohol, you will find that it rapidly becomes dry. Why is it that while it is drying, your hand feels cool ?
Advertisements
Solution
Alcohol is a volatile liquid. It evaporates very fast by absorbing heat from surroundings. When our hand is moistened with alcohol, drops of alcohol absorb heat from the hand to achieve latent heat of vaporization and evaporate. As the hand loses heat to alcohol, it feels cool. This is an example of cooling by evaporation.
APPEARS IN
RELATED QUESTIONS
How does water kept in an earthen pot (matka) become cool during summer?
What produces more severe burns, boiling water or steam?
Water in a dish evaporates faster than in a bottle. Give reason.
Why are volatile liquids such as alcohol and spirit stored in tightly closed bottles?
Define the following terms Condensation
Why are we able to sip hot tea or milk faster from a saucer rather than from a cup ?
The evaporation of water increases under the following conditions :
The amount of vapour in 1 cu.m. of air shows the ______.
Can you suggest a method to collect water from sea water?
How does the water kept in an earthen pot remain cool?
