How could you demonstrate evaporation?

Materials needed:

- A shallow dish or bowl

- Water

- Food coloring (optional)

- A sunny spot or a heat source (like a stove)

Procedure:

1. Fill the shallow dish or bowl with about 1 inch (2.5 cm) of water.

2. If you want to make it more visually appealing, you can add a few drops of food coloring to the water.

3. Place the bowl in a sunny spot outdoors or near a heat source indoors.

4. Observe the water level over time.

What happens:

As water is exposed to the sun or a heat source, the molecules gain energy and start moving faster. This causes some water molecules to break away from the liquid surface and enter the atmosphere as water vapor. This process is known as evaporation.

You will notice that the water level in the bowl gradually decreases over time as more and more water molecules evaporate. The water eventually disappears completely, leaving behind any dissolved substances (like salt or food coloring).

This simple experiment demonstrates the concept of evaporation and illustrates how liquid water can transform into water vapor and become a part of the atmosphere.