In an experiment, 4 liters of water was observed to evaporate in 20 hours. what rate of evaporation was observed in this experiment?

The Rate of Evaporation of water is the rate at which water evaporates per unit time. It is measured in liters per hour. Following is the how the calculation is done for this question:

Volume of water = 4 liters

Time taken to evaporate = 20 hours

Therefore, Rate of evaporation = Volume of water / Time taken to evaporate

= 4 / 20

= 0.2 litres / hour