Science Project Details:

What affects the rate of evaporation of water.

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Difficulty: Beginner 2
Cost ($): 5
Time required: < 1 hour
1 hour to prepare, 4 hours for experiment
Availability of materials: Readily available
Easily found
Required Skills: None
Safety concerns:

None

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Materials

The materials required for this experiment:

  • 5 plates that can hold 100ml water
  • 1 glass that can hold 100ml water (the area of the mouth of the glass must be at least 3 times smaller than the plate)
  • 600 ml water
  • 1 fan

Procedure

  1. For this experiment, the independent variables are the water- surface area, temperature and air pressure. The dependent variable is the rate of water evaporation. The constants (control variables) are the amount of water used in each experiment.
  2. The glass and one of the plates are filled with 100ml of water each. The water in the plate will have a larger surface area than the water in the glass. The rate of evaporation is observed every 10 minutes. The results are recorded in the table below.
  3. Two of the plates are filled with 100ml of water each. One of the plates is placed indoors where the temperature is cooler and the other plate is placed directly under the sun where the temperature is higher. The rate evaporation of the water is observed every 10 minutes. The results are recorded in the table below.
  4. The last two plates are filled with 100ml of water each. One of the plates is placed directly in the pat of the wind from the fan and the other plate is placed away from the fan. The wind from the fan will reduce the air pressure around the first plate. The rate of evaporation of the water is observed every 10 minutes. The results are recorded in the table below.