Acetone, perfume and petrol are volatile liquids, i.e., they have low boiling points. When kept on palm, they can absorb enough energy from the palm or surroundings and evaporate and leave the palm cool.

We should wear cotton clothes during summer season. Because during summer we perspire more to maintain the temperature of our body. Cotton is a good absorber of water (sweat). It then exposes the water to atmosphere for easy evaporation leaving us dry and cool.

To change a temperature on the kelvin scale to the celsius scale. Subtract 273 form given temperature.

300 K = 300 - 273 = 27°C

Hot tea or milk cover larger surface area on a saucer and resulting in increase of evaporation. The tea or milk thus cool faster on a saucer and we can sip it more comfortably.