Question

How can you show that evaporation causes cooling.

Answer 1

hey friend
when we put some acetone or perfume on our palm it make us feel cool .This is because it evaporate constantly and causes cooling
hope this helps u

Answer 2

Evaporation is the process of conversion of water (liquid) to the water vapor (gaseous state). When liquid changes to gaseous state it absorbed some heat or energy from surrounding that decrease the temperature of surrounding and causes cooling effect.  

One of the live example is sweating. In hot summer days, sweat evaporate causes cooling effect that balance the temperature of body.  

Hence, evaporation is effective process that balance our body temperature in hot sunny days.