UEN Security Office
Technical Services Support Center (TSSC)
Eccles Broadcast Center
101 Wasatch Drive
Salt Lake City, UT 84112
(801) 585-6105 (fax)
The purpose of this activity is to provide students with a hands-on experience of seeing how the processes of condensation and evaporation occur.
Water is made up of molecules that are always moving. It can be found in different states: solid, liquid, or gas. Adding or taking away heat causes the molecules to speed up or slow down.
Condensation is when water changes from a gas to a liquid. The opposite of this is evaporation. Evaporation is when water changes from a liquid to a gas. When water is in the state of a gas it is called water vapor. We cannot see it because the molecules are too far apart. As the molecules collect together during condensation, we can see evidence that this process takes place.
A common misconception is that when we see water droplets on the grass early in the morning, that we are seeing condensation. What we are really seeing is the result of condensation called dew. Dew is made up of small drops of water that form from the night air and collect on the ground or another surface. The dew point is the temperature at which condensation occurs.
Temperature, humidity, and wind are factors that cause these processes to occur.
Increasing the amount of thermal energy causes water to change states from a solid to a liquid and from a liquid to a gas. At sea level, water heated to 100° C (212° F) boils. Water freezes at 0° C (32° F). In Utah, water boils at about 96° C. This is why it takes longer to cook food at higher elevations.
3. Understand Science Concepts and Principles
4. Communicate Effectively Using Science Language and Reasoning
Invitation to Learn
Have you ever gotten out of the shower and tried to look in the mirror to comb your hair and the mirror was all covered with water? You probably rubbed off the water with your hand or a towel so that you could see yourself, but did you ever wonder how it happened?