Evaporation of water is affected by the surface area of the water.

Hypothesis: As the surface area of water increases, the rate of water evaporation also increases.

(i) Aim: To study the effect of surface area on the rate of water evaporation.

(ii) Variables:
manipulated variable - surface area of water
responding variable - rate of water evaporation
constant variable - water volume

(iii) Apparatus:
Three containers with different diameters, measuring cylinder

(iv) Procedure:
• 100 cm3 of water is measured with a measuring cylinder and is poured into the three containers with different diameters.
• All the three containers are left in the laboratory for one day.
• The next day, the water left in the containers is poured into the measuring cylinder and their volumes are measured respectively

(v) Results:

(vi) Conclusion:
The rate of water evaporation increases as the surface area of water increases.