Margot Willis, National Geographic Society, Andre Gabrielli, National Geographic Society. Join our community of educators and receive the latest information on National Geographic's resources for you and your students. She or he will best know the preferred format. In the water cycle evaporation is the process where water converts or transform in liquid to vapor form. Substances can exist in three main states: solid, liquid, and gas. Have you ever been asked these questions by people, especially those kids who keep asking, 'Why?' Table salt is obtained from saline sea water through evaporation, in evaporation ponds. Precipitation – this is when so much water condenses that the clouds get heavy and water falls back to earth as rain (or snow). In a liquid, the molecules move freely, but stay close together. The heat from the sun makes the water molecules move faster and faster, until they move so fast they escape as a gas. Afterwards the clouds release the moisture as precipitation. The Rights Holder for media is the person or group credited. process by which water vapor becomes liquid. Use these standards-aligned resources to teach middle schoolers more about condensation, precipitation, and weather patterns that are affected by, and a part of, the water cycle. National Geographic Headquarters The sun provides solar energy that powers the evaporation process. How about fog? If you have questions about how to cite anything on our website in your project or classroom presentation, please contact your teacher. When solid water is exposed to enough heat, it will melt and return to a liquid. The water vapour in the air gets cold and turns back into a liquid to form clouds. In this evaporation water transform into vapor and water bodies moves to the atmosphere, according to Michigan Technology University. When air pressure is also high on the surface of a water body, evaporation is hindered. Evaporation is the process by which a liquid turns into a gas. Terms of Service |  These changes between states (melting, freezing, and evaporating) happen because as the temperature either increases or decreases, the molecules in a substance begin to speed up or slow down. The heat from the sun makes the water molecules move faster and faster, until they move so fast they escape as a gas. Evaporation from the oceans is vital to the production of fresh water. They stay in the atmosphere, and affect humidity and influence the moisture amounts in the air. Code of Ethics. Water from oceans, rivers, swamps, lakes, plants and even humans is converted to vapor in the water cycle, according to NASA’s Center for Educational Technologies. Water evaporates from a sugar beet field after a summer shower in Borger, Netherlands. Diagram of water changing to vapor and rising upward. Gina Borgia, National Geographic Society It can be easily visualized when rain puddles “disappear” on a hot day or when wet clothes dry in the sun. Evaporation is one of two forms of vaporization, … For information on user permissions, please read our Terms of Service. Evaporation accounts for 90 percent of the moisture in the Earth’s atmosphere; the other 10 percent is due to plant transpiration. Evaporation is a key step in the water cycle. Surface tension is the elastic tendency of a fluid that allows insects to float on water and have tension that allows for bubbles formation. In the water cycle, evaporation occurs when sunlight warms the surface of the water. The fresh-water vapor then condenses into clouds, many of which drift over land. 1145 17th Street NW By James Karuga on April 25 2017 in Environment. In meteorology, the substance we are concerned about the most is water.For evaporation to take place, energy is required. Evaporation is just one way a substance, like water, can change between these states. By evaporation, water in the liquid … The conversion to vapor ensures water is transferred from land and water bodies into the atmosphere, according to Michigan Technological University. Where does the water that forms rain come from? Evaporation happens on a global scale. Text on this page is printable and can be used according to our Terms of Service. Evaporation is an important part of the water cycle Condensation – this is when a gas turns back into a liquid. Where does that come from? Evaporation is the process by which water converts from liquid to vapor form. As a result, the water levels decrease due to exposure of heat from the sun, according to National Geographic. When water is heated, it evaporates after the molecules move and vibrate so quickly, they escape into the atmosphere as water vapor molecules. For thousands of years, evaporation has been utilized in livelihoods. When the body heats up due to the air temperature or through exercise, the b… Water (a liquid) turns into vapor (a gas) when heat energy is applied to raise its temperature to 100°C (212°F). When water is heated, it evaporates after the molecules move and vibrate so quickly, they escape into the atmosphere as water vapor molecules. In a gas, they move around wildly and have a great deal of space between them. Such an occurrence is likely in storms that result in high pressure that hinders evaporation according to National Geographic. Around 80 percent of all water evaporation comes from the oceans and the rest from inland water and vegetation. The audio, illustrations, photos, and videos are credited beneath the media asset, except for promotional images, which generally link to another page that contains the media credit. When it is cool enough, the water vapor condenses and returns to liquid water. Alongside condensation and precipitation, evaporation is one of the three main steps in the Earth’s water cycle. If a media asset is downloadable, a download button appears in the corner of the media viewer. All rights reserved. The energy can come from any source: the sun, the atmosphere, the earth, or objects on the earth such as humans.Everyone has experienced evaporation personally. When liquid water reaches a low enough temperature, it freezes and becomes a solid—ice.