Science+Fair+Lit+Review+CM2


 * __REVIEW OF LITERATURE__**

Before I began this experiment, I needed to find out what is evaporation? I went to a website and it said, “Evaporation is defined as the changing of water from a liquid to a gas ( Weather questions.com ). Another website had an article called “Evaporation and Melting.” This article stated, “Water is transferred from the surface of the earth into the atmosphere through evaporation.” The article also stated, “Water can evaporate or disappear with the help of heat”( Kidport Reference Library ). In an article called “Evaporation” it said, “Evaporation can occur when liquids are cold or when they are warm, but happens more often with warmer liquids ( Chem4Kids.com ). In Wikipedia, it stated, “Evaporation is when a liquid transforms into a gas.” (Wikipedia)

All of my research material was taken from the internet. The articles I read answered the following questions:

1) What is evaporation? Evaporates means to disappear and it is the changing of a liquid to a gas.

2) How does the liquid evaporate? Evaporation occurs when molecules in the liquid escape and turn into gas.

3) How does heat increase the rate of evaporation? At higher temperatures, the molecules in the water crash into one another. This crashing creates energy that is transferred back and forth. The molecules that are on top have enough energy to escape or evaporate. I think of it as being in a crowded store and people are all bumping into each other. The people that are closest to the doors get to leave and escape from the crowded store.

In summary, evaporation is how water moves from a liquid state back into a water vapor. Energy is used to break the bonds that hold water molecules together. When water boils it easily evaporates. It evaporates much more slowly at the freezing point.

__**MATERIALS**__


 * Three cardboard boxes; rectangle box in size about 12 x 12
 * Three 8 ounce glasses of water
 * Two light bulbs: 60 watts and 40 watts
 * Two electrical sockets to turn on the light bulbs


 * __METHODS OF PROCEDURE__**
 * 1) Get three cardboard boxes that are the same size with covers.
 * 2) Put an electrical outlet inside two of the boxes.
 * 3) The third box will not have any electrical outlet.
 * 4) Place an 8 ounce glass of water inside each of the three boxes.
 * 5) The two light bulbs are turned on and left on for 72 hours.
 * 6) After 72 hours, I will measure the water in the three glasses and record the how much water is left

= **Works Cited** =

Foundation, W . (2013, March 10). "Evaporation." //Wikipedia//. Retrieved October 3, 2013, from[]
 * This page from Wikipedia is defining ther word Evaporation, as a type of vaporization of a liquid that occurs from the surface of a liquid into a gas.

Knysh, B. (n.d.). "Evaporation and Melting." // Reference Library //. Retrieved September 18, 2013, from []
 * This website article is about how matter can change its physical form by a change in temperature. At low levels and high levels of temperature the molecules can be changed into gas and evaporate.

Moyer, R . (2000). "Topic 5 Physical Science." In //McGraw-Hill Science//. (p. 71). New York, NY: McGraw-Hill School Division.
 * This page explains how cooling changes matter, and defines evaporation as the changing of a liquid to a gas.

Studios, A. R.  (n.d.). "Evaporation of Liquids." //Chem4Kids.com//: Matter: Evaporation. Retrieved September 17, 2013, from []
 * This article defines the evaporation of liquids. All liquids can evaporate at room temperature and normal air pressure. This happens because the molecules escape from the liquid and turn into a vapor.

Weatherstreet, C.  .. (2013). "What causes evaporation?" //Weather Questions//. Retrieved September 16, 2013, from []
 * This article explains how important evaportation is to our weather. Water is continuously being evaporated from the surface of the Earth into the atmosphere.