Advertisements
Advertisements
प्रश्न
What is evaporation? Why does it cause cooling?
Advertisements
उत्तर
Evaporation is the phenomenon of a change of a liquid into vapour without raising the temperature. Evaporation needs energy for phase change from liquid to gases. As water evaporates off your skin, it absorbs energy(heat) from the body to make the phase change to gas thus cooling the body.
APPEARS IN
संबंधित प्रश्न
What is the Kelvin scale of temperature?
State one use of each of the following type of thermometer:
Clinical thermometer
State one use of each of the following type of thermometer:
Six's maximum and minimum thermometer.
Explain the three modes of transfer of heat.
Give a scientific reason for the following:
In winter the human body covered with a blanket keeps warm.
One litre of water at 30o C is mixed with one litre of water at 50o C. The temperature of the mixture will be
Give reason for the following
The electric wire which sag in summer become straight in winter.
What do you understand by thermal equilibrium?
Give reasons why –
an igloo is built as a winter shelter
What is the minimum possible temperature? Is there also a maximum possible temperature?
