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# Water vapor investigation 3-3

## on Jan 26, 2011

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Slides from Evaporation Location and Surface Area.

Slides from Evaporation Location and Surface Area.

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## Water vapor investigation 3-3Presentation Transcript

• Focus Question: What items affect evaporation rates? Water Planet Investigations 3-2 & 3-3
• Drying Up Questions  What is water vapor?  Where is water vapor?  What does water vapor look like?  What happens when a wet object gets dry?
• Does Location Affect Evaporation?  Where might we put the wet paper towel so it would dry quickly?  Where would it dry slowly?  How can we find out how fast water will evaporate in these locations?
• Does Surface Area Affect Evaporation?  Compare size of openings for each container  Area of the water touching the air is surface area  In which container will water have the largest surface area?  In which container do you thing water will evaporate fastest?
• Variables and Controlled Experiments  Anything you can change in an experiment that might affect the outcome of the experiment is a variable  A controlled experiment is an experiment in which one, and only, one variable is changed in order to find out how it affects the outcome of the experiments. All other variables are kept the same, or controlled.
• Surface-Area Experiment  If you want to find out if surface area affects the amount of evaporation, how would you set up the investigation?  What variables will you control?  What variable will you change? ~  Evaporation Place Mat-4 containers  Label mat, position tray and containers  Add 25-ml of water to each container
• Location Experiment  Label four cups (A, B, C, D and room/group number)  Measure 50-ml of water in each cup  Place each cup on matching letter tray  Monitor temperature twice each day  Record temperature on class chart
•  Location  Surface Area Determine the amount of water that evaporated from each cup.  Measure amount remaining, subtract from starting amount  Complete first two rows of chart - surface area ranking, beginning water  Measure and record amount of water remaining - begin with graduated cylinder  Use a graduated cylinder to measure volume of water  Calculate amount of water lost to evaporation  Plan procedure, then begin   Record measurements/results on Evaporation Location Charts - charts 1 and 2, answer Q1-4 Order empty containers from greatest to least amount of evaporation  Compare amount of evaporation to surface area for each container - rank containers in row 5; answer Q12  Share information with Evaporation Location groups (1-2, 3-4, 5-6, 7-8)  Complete Evaporation Location Charts and questions   Share information with Surface Area group (1-2, 3-4, 5-6, 7-8)  Complete Surface Area Chart and questions
• Wet Paper Towel  Describe the best way to dry a wet paper towel. Consider location and surface area in your answer.
• Vocabulary  Seriate  To put objects in order by one property, like the amount of water left.  Thermometer  A tool used to measure temperature.  Surface Area  The area of liquid exposed to or touching the air.
• Content  Where did the most evaporation happen?  Where did the least evaporation happen?  What is the relationship between temperature and evaporation?  How does surface area of a volume of water affect evaporation?  Your Questions?  Homework: Read Evaporation, pg 184-186 + answer questions. Icheck 3 on Friday 1/17
• Evaporation Questions  What causes evaporation?  Why does warm water evaporate faster than cold water?  How is water vapor different from liquid water?  How does temperature affect the amount of water vapor in the air?