This project involves testing two dampened cloths to see which method causes faster evaporation to occur, heat or air flow. Start this experiment by wetting two washcloths in equal amounts of water. Hang one outside on a clothesline and spread the other one out flat on a plate or chopping board and place it in direct sunlight. Record data on how quickly the water evaporates from each cloth. Display the data on a chart or graph for the science fair. Conclude the experiment by researching the results. Find out why one dried faster than the other and include this information on the display.
For this experiment, gather four different wattage light bulbs and four glass bowls. Measure 1 cup of water into each bowl and place a piece of masking tape on the outside of the bowl to mark the water level. Place each bowl directly under a light bulb. Use varying wattages of light such as 25, 60, 90 and 120 watts to vary the amount of heat that each bowl of water is exposed to. Record the water level at two-hour intervals throughout a full day. Chart your results on a graph for the science fair.
Pour 1 cup each of cola, apple juice and orange juice into clear glass bowls. Set the bowls next to each other on a countertop or table that is not exposed to sunlight at any time of the day. This will allow for temperature control. Observe the liquid levels three times a day for five days. Record the rate of evaporation for each liquid and chart the results for the science fair. Research the different ingredients in each liquid and display information for the fair on why one liquid evaporated faster than another.
Use two clear glass containers for this experiment and pour 1 cup of water into each. In one container, add 3 tbsp. of sugar. Add 3 tbsp. of table salt to the other. Stir each thoroughly until well mixed. Place each container on flat surface away from sunlight or other heat exposure. Observe the mixtures for the next three days and record the effect that the different chemicals have on the rate of evaporation. Chart the results to display at the fair.