With this project, you're going to demonstrate that higher temperatures cause water droplets to evaporate more quickly than identical water droplets maintained at lower temperatures. Furthermore, you're going to show how each increase in temperature speeds up the evaporation of these water droplets in a way that is both measurable and uniform.
To complete this project you're going to need a griddle with temperature controls, a ceramic plate for your room-temperature droplets -- your control droplets, a bottle of water, a pipette with at least a 1-milliliter capacity, a stopwatch so you can measure evaporation times and a log sheet and pencil so you can record your results.
At your station, plug in the hot plate. Turn on the griddle to 100 degrees Fahrenheit and let it heat up. Pipette three, one-half milliliter droplets from the water bottle and onto the ceramic plate -- which should be on the table beside the hot plate and not on it, and make sure the droplets don't touch one another. When the hot plate is heated up, have the stopwatch ready. Then, pipette three, one-half milliliter droplets directly onto the surface of the hot plate and start the stopwatch. When the droplets have completely evaporated, stop the timer and record the time and temperature on your log sheet. Continue to time the evaporation of droplets on the griddle, but with higher and lower temperatures, and each time recording the temperature and time it took to evaporate completely.
When adjusting the temperature of the griddle, work in increments of 10 degrees to keep your adjustments uniform. That way you can analyze the evaporation times and draw conclusions about how increased or decreased temperature affects the speed of evaporation, which you can explain to observers as the result of water molecules being raised to higher states of excitement. You can also experiment with larger droplets of water. However, always record the volume of the droplets so your results remain accurate.
Griddles can get extremely hot and whenever you work with one you risk getting burned. Furthermore, when dropping water droplets onto a hot griddle, you risk having the hot droplet splatter back, so be careful when applying water to the griddle.