Slides from Evaporation Location and Surface Area.

1. Focus Question: What items
affect evaporation rates?
Water Planet
Investigations 3-2 & 3-3

2. 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?

3. 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 think water will
evaporate fastest?

4. 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.

5. Surface-Area Experiment
Groups 1, 3, 5, 7
 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

6. Location Experiment
Groups 2, 4, 6, 8
 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

7.  Location
 Determine the amount of water
that evaporated from each
cup.
 Measure amount remaining,
subtract from starting
amount
 Use a graduated cylinder to
measure volume of water
 Plan procedure, then begin
 Record measurements/results
on Evaporation Location Charts
- charts 1 and 2, answer Q1-4
 Share information with Surface
Area group (1-2, 3-4, 5-6, 7-8)
 Complete Surface Area Chart
and questions
 Surface Area
 Complete first two rows of
chart - surface area ranking,
beginning water
 Measure and record amount
of water remaining - begin with
graduated cylinder
 Calculate amount of water lost
to evaporation
 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 Q1-
2
 Share information with
Evaporation Location groups
(1-2, 3-4, 5-6, 7-8)
 Complete Evaporation
Location Charts and questions

8. Wet Paper Towel
 Describe the best way to dry a wet paper towel.
Consider location and surface area in your
answer.

9. 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.

10. 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

11. 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?