Focus Question: What items
affect evaporation rates?
Investigations 3-2 & 3-3
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
Compare size of openings for each container
Area of the water touching the air is surface
In which container will water have the largest
In which container do you think water will
Variables and Controlled Experiments
Anything you can change in an experiment that
might affect the outcome of the experiment is a
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,
Groups 1, 3, 5, 7
If you want to find out if surface area affects the
amount of evaporation, how would you set up
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
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
Determine the amount of water
that evaporated from each
Measure amount remaining,
subtract from starting
Use a graduated cylinder to
measure volume of water
Plan procedure, then begin
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
Complete first two rows of
chart - surface area ranking,
Measure and record amount
of water remaining - begin with
Calculate amount of water lost
Order empty containers from
greatest to least amount of
Compare amount of
evaporation to surface area
for each container - rank
containers in row 5; answer Q1-
Share information with
Evaporation Location groups
(1-2, 3-4, 5-6, 7-8)
Location Charts and questions
Wet Paper Towel
Describe the best way to dry a wet paper towel.
Consider location and surface area in your
To put objects in order by one
property, like the amount of water
A tool used to measure
The area of liquid exposed to or
touching the air.
Where did the most evaporation happen?
Where did the least evaporation happen?
What is the relationship between temperature
How does surface area of a volume of water
Homework: Read Evaporation, pg 184-186 + answer questions
What causes evaporation?
Why does warm water evaporate faster than
How is water vapor different from liquid water?
How does temperature affect the amount of
water vapor in the air?