For this activity you will need

• A small amount of warm water
• a pipette *
• a piece of thermal sensing sheet * that has a color at room temperature. If all your pieces are black, find a warmer room to work in.
• a glass vial *

Suppose we place a drop of hot water on the table top. How will the temperature change? What will be the temperature after 1 second? After 10 seconds? After 2 minutes? After 10 minutes? Make predictions for these (this is an invitation for you to apply what you have learned already; it also will make it more likely you will notice if anything unusual happens).

Suppose further that you put a drop of very hot water on a piece of thermal sensing sheet that already has a color (other than black) at room temperature. What color do you expect the sheet to be at various times? Again make predictions.

Now try it. Use the pipette to put several very tiny drops on the thermal sensing sheet, by just touching the end to the surface. Then watch carefully what happens.

What happens to the temperature of the water drop, as indicated by the color change?

Now place the glass vial inverted over one of the drops, and observe (through the glass) what happens over the next minute or so.

Then uncover the drop and see what happens.

More about evaporation: Making dew (with what we have)