Note that lake evaporation in Figure 4. Is this value higher than you expected? We encourage the reuse and dissemination of the material on this site for noncommercial purposes as long as attribution to the original material on the InTeGrate site is retained. Material on this page is offered under a Creative Commons license unless otherwise noted below. Show terms of use for text on this page ». Show terms of use for media on this page ». Disclaimer: Any opinions, findings, conclusions or recommendations expressed in this website are those of the author s and do not necessarily reflect the views of the National Science Foundation.
Your Account. Learn More. These materials are part of a collection of classroom-tested modules and courses developed by InTeGrate. The materials engage students in understanding the earth system as it intertwines with key societal issues. The collection is freely available and ready to be adapted by undergraduate educators across a range of courses including: general education or majors courses in Earth-focused disciplines such as geoscience or environmental science, social science, engineering, and other sciences, as well as courses for interdisciplinary programs.
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Or you can download these pages in several formats that you can include in your course website or local Learning Managment System. Create a saltwater mixture by combining 1 cup of pure water with 1. Create a scale on the side of your cups.
Use a sharpie and a ruler to make 3 large even marks along the side of each cup spaced 1 inch apart. Then make small half-inch marks in between the large inch marks. Do this again to make even smaller quarter-inch marks on the cups. It is important that the marks made on each cup are the same for comparison. Fill each cup with a different liquid pure water, saltwater, rubbing alcohol and orange juice. Only fill the cups to the top 3-inch sharpie mark. Double-check that each cup has the same volume of liquid to start with and that the sharpie marks on each cup match one another.
Make a data chart to keep track of the level inches of each liquid on a daily basis. See below for an example:. Check on the cups every morning and record the height of each liquid using the measurement scale you created on the cups.
Repeat this process for seven days OR until one of the liquids disappears completely. For consistent results, try to check on your experiment at the same time each day. Draw a line graph of your results with one colored line representing each of the liquids. Different liquids will evaporate at different rates because they contain different molecules, which require different amounts of energy to separate them.
Liquids with weaker attractions between molecules will evaporate faster, and liquids with strong attraction between molecules will take much longer to evaporate. If no button appears, you cannot download or save the media. Text on this page is printable and can be used according to our Terms of Service. Any interactives on this page can only be played while you are visiting our website.
You cannot download interactives. The movement of water throughout Earth can be understood as a cycle where H20 moves from one state of matter to another. 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.
The water cycle describes how water is exchanged cycled through Earth's land, ocean, and atmosphere. The water cycle is the endless process that connects all of the water on Earth. Join our community of educators and receive the latest information on National Geographic's resources for you and your students.
Skip to content. Image Evaporation on a Farm Water evaporates from a sugar beet field after a summer shower in Borger, Netherlands. Twitter Facebook Pinterest Google Classroom. Encyclopedic Entry Vocabulary.
Media Credits 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. Media If a media asset is downloadable, a download button appears in the corner of the media viewer. The reason for that is that the amount of heat transfer also depends on the evaporation rate.
As alcohol evaporates at a much faster rate compared with water due to its lower boiling temperature 82 compared to degrees C , it is able to carry away more heat from the skin.
This means for a given amount of time much more alcohol evaporates than water. You probably noticed this also when you did the extra activity of putting the same amount of alcohol and water outside in the sun and monitored their evaporation rates. Other factors that influence evaporation rates are the surface area, temperature and airflow. Cleanup Flush any unused rubbing alcohol down the sink with plenty of cold water.
Wash your hands with soap, and clean your work area. This activity brought to you in partnership with Science Buddies. Already a subscriber? Sign in. Thanks for reading Scientific American. Create your free account or Sign in to continue. See Subscription Options. Go Paperless with Digital. Key concepts Physics Evaporation Heat transfer Temperature Introduction Have you ever wondered why we sweat when our environment is hot or when we exercise? Materials Rubbing alcohol Water Two small cups or bowls Tablespoon Pipet or medical dropper Preparation Fill one small cup or bowl with one tablespoon of water.
Fill the second small cup or bowl with one tablespoon of rubbing alcohol. Procedure Suck up some water from the first bowl water using the pipet or medical dropper. Carefully drop one or two drops on the back of our hand and spread the liquid with your fingers. When the water touches your skin, how does it feel? Blow softly over the skin area that you just covered with water.
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