Developing and Using Models
Toolkit Overview Video for this Practice
Science often involves the construction and use of a wide variety of models and simulations
to help develop explanations about natural phenomena. Models make it possible to go
beyond observables and imagine a world not yet seen. Models enable predictions of
the form “if . . . then . . . therefore” to be made in order to test hypothetical
Engineering makes use of models and simulations to analyze existing systems so as
to see where flaws might occur or to test possible solutions to a new problem. Engineers
also call on models of various sorts to test proposed systems and to recognize the
strengths and limitations of their designs.
See A Framework for K-12 Science Education, 2012, p. 56 for the entire text.
1. From the background information, what new awareness do you have about developing
and using models?
2. In a 3-Dimensional classroom, what would this Practice look like?
3. What questions did the background raise for you?
4. Unpack this Practice by identifying the verbs and nouns in the description. Is
your list similar to this?
Developing and Using Models Podcast
NGSS @ NSTA
1. What are your current beliefs about this practice?
2. In what ways do you think you are using this practice?
3. What challenges do you see to using this practice?
Conceptual Change Activities:
Developing and Using Models Activity#1: Syringe and Plunger
Developing And Using Models Activity #2: Create Your Own Water Cycle
Developing And Using Models Activity#3:Build a Bug
Developing and Using Models Activity #4:Goldilocks Principle
Developing and Using Models Activity #5: Measuring Atmospheric Pressure
Developing Conceptual Understanding of Developing and Using Models Activity Background
The purpose of the following activities is to engage teachers in the practice of developing
and using models. The emphasis is NOT on the activity itself, but rather the conceptual
change related to the practice. Consumers of this Toolkit are reminded not to get
wrapped up in the activity, but rather continually reflection on the conceptual nature
of the practice to gain deeper understanding . Five activities have been provided
to engage in each Practice.
Since the following activities are NOT lesson plans, in some cases only a brief explanation
of the activity has been provided. The facilitator should encourage learners to direct
their own investigations and intervene only as needed to redirect.
Developing and Using Models Activity #1: Syringe and Plunger
General Objective: The purpose of this activity is to make a model from the evidence
based on observation.
In this activity we will observe the phenomenon of a syringe and a plunger.
Materials: large syringe
Each group of students is given a syringe and a plunger. Students are instructed to
complete two tasks:
1. Fill the syringe with air and place your finger over the end and observe what
happens when the syringe is pulled back.
2. With the end still sealed, push the plunger in as far as you can and observe what
Students then create models (drawings in notebook) to show the phenomenon of what
they think happens to one air particle. Students will draw three models, one showing
a picture of a particle of air in the middle of the syringe when filled with air,
one showing where and what the single particle looked like when the plunger was pulled
back, and one with the plunger pushed in. In both instances the plunger returned
to its original spot.
The students then share the models and describe their models. Students may struggle
with this concept because it is difficult to picture one particle of air. It may
be easier to show the relationship between particles, but looking at one particle
might help students to understand the idea of compression and expansion.
Extension: Have students explore further to see what might happen if water or bubbles
were placed inside the plunger.
From Starr & Associates, Educational Consultants
Developing and Using Models Activity #2: Create Your Own Water Cycle
This activity is used to simulate how to develop and use models in the classroom.
Objective: Students will learn the water cycle and different states of matter.
Background: Water enters the watershed from a three stage cycle that starts when water
falls from the sky in a process called precipitation. Precipitation begins when water
vapor molecules become too large and heavy to remain in the atmosphere (in the form
of clouds) and fall to the ground in the form of rain, snow, sleet or hail. Once
precipitation has fallen to the ground, it is collected in large bodies of water such
as lakes, ponds, rivers and oceans. Water at the surface of these bodies of water
heats up under the sun and evaporates. Evaporation occurs when water transforms from
a liquid into a gas, rising up toward the sky. Next, evaporated water condenses in
the atmosphere. Condensation transforms water from a gas into a vapor and becomes
suspended in the atmosphere; this is visually represented by clouds.
• Water Cycle Diagram (Transparency)
• Large piece of paper
• Small paper squares
• Clear plastic cups
• Ice cubes
• Electric tea kettle
• Plastic wrap
• Science Notebook
Prep: Create Transparency from Water Cycle Diagram
1. Display the Water Cycle Transparency to the class. Ask students to draw a model
of the water cycle in their science notebooks.
2. Fill plastic cups halfway with water and place one cup on the student's desk. Explain
to the students that this is liquid water, representing the rain and lake water in
the picture of the water cycle.
3. Boil water in the kettle. Explain to the students that the steam is water in the
form of gas called water vapor.
4. Give each student some ice cubes and explain to the students that this is water
in a solid state. Have them put the ice cubes in their cup of water.
5. Let the ice sit for a few minutes.
6. When the cups start “sweating” explain to the students that this is condensation
and ask what is causing the sweating.
• Large, empty, well cleaned pickle Jars for each group of students or individuals
• Plastic wrap
• Rubber bands for each jar
• Sand or pebbles to line the bottom of the jar
• Plastic cup
Have students place a layer of sand or pebbles at the bottom of each jar. Plant small
plant in the jar and bury plastic cup in soil to simulate a pond or lake and add enough
water to fill the cup. Put plastic wrap over the entire mouth of the jar and secure
with a rubber band. Place the jar in a warm, sunny spot. The students will see droplets
of water on the bottom surface of the plastic wrap. Ask the students to explain in
their science notebooks why this occurred. Ask students to illustrate their jars
and write observations focusing on the three states of matter (liquid, gas and solid)
and transferring the vocabulary to precipitation, condensation and evaporation. Further
investigation would be to add an ice cube on top of the plastic wrap to see if it
causes any change. Ask students what the ice cube would represent in the atmosphere,
and why it would cause condensation.
Click http://water.epa.gov/learn/kids/drinkingwater/upload/activity_grades_k-3_watercycle-2.pdf for worksheet.
Using an aquarium, ask the students to design a more realistic ecosystem using moss,
lichen and small plants to investigate if the water cycle can sustain life ( i.e.
Developing and Using Models Activity #3: Build-A-Bug
General Objective: Students will create a model of an insect to show how internal
and external components are essential for the function and survival of their model
**This modeling activity could be used for multiple grade levels and with many various
organisms and groups of animals.
• Science notebooks
• Construction paper
• Tissue paper
• Markers, crayons, colored pencils
• Aluminum foil
• Plastic wrap
• Pipe cleaners
• Encourage individual materials brought from home
1. Students need basic background knowledge of the structures of insects, such as, exoskeleton,
head, abdomen, thorax, antennae, and 6 legs and also the concept of specialization
and adaptation. Student interest can be introduced by showing examples of unique
insects that exist in nature.
2. Using provided materials, students are to design a new insect. Their models are to
include the all the standard parts of an insect, along with their own unique additions.
Students are to consider special adaptations for their insect depending on where
the habitat is located.
3. Students can draw their insects in their student notebooks and include detailed labels.
You can also have students describe how their insect performs the following tasks:
• Defense against predators
• How the insect changes throughout lifespan
• Survival in the environment conditions
• Unique behaviors
• Food consumption
Have students write creative stories or comics using their insect models as main characters.
Build insects in other stages of their life cycles.
Developing and Using Models Activity #4: The Goldilocks Principle: A Model of Atmospheric
Grades Targeted: 6-8
General Objectives: Students will understand that our two closest neighbors, Venus
and Mars, have very different atmospheres than Earth does in terms of pressure and
Students will be able to understand the “Goldilocks Principle” and understand that
Earth’s moderate temperature is due primarily to its unique atmosphere.
Background: On earth, two elements, nitrogen (N2) and oxygen (O2), make up almost 99% of the volume of clean, dry air. Most of the remaining 1% is
accounted for by the inert gaseous element, argon (Ar). Argon and the tiny percentage
of remaining gases are referred to as trace gases. Certain trace atmospheric gases
help to heat up our planet because they appear transparent to incoming visible (shortwave)
light but act as a barrier to outgoing infrared (longwave) radiation. These special
trace gases are often referred to as "greenhouse gases" because a scientist in the
early 19th century suggested that they function much like the glass plates found on
a greenhouse used for growing plants.
The earth's atmosphere is composed of gases (for example, CO2 and CH4) of just the right types and in just the right amounts to warm the earth to temperatures
suitable for life. The effect of the atmosphere to trap heat is the true "greenhouse
We can evaluate the effect of greenhouse gases by comparing Earth with its nearest
planetary neighbors, Venus and Mars. These planets either have too much greenhouse
effect or too little to be able to sustain life as we know it. The differences between
the three planets have been termed the "Goldilocks Principle" (Venus is too hot, Mars
is too cold, but Earth is just right).
Mars and Venus have essentially the same types and percentages of gases in their atmosphere.
However, they have very different atmospheric densities:
• Venus has an extremely dense atmosphere, so the concentration of CO2 is responsible for a "runaway" greenhouse effect and a very high surface temperature.
• Mars has almost no atmosphere; therefore the amount of CO2 is not sufficient to supply a warming effect and the surface temperatures of Mars
are very low.
• Mars is much further away from the Sun than is Venus.
Earth has a very different type of atmosphere. Our atmosphere has much less CO2 than Venus or Mars and our atmospheric pressure is close to midway between the two
(1/90th that of Venus and 100 times that of Mars).
Many scientists believe that the composition of our atmosphere is due to the presence
of life. Life acts to keep Earth's atmosphere in a dynamic balance. In other words, if life were to completely disappear, eventually our atmospheric composition
could come to closely resemble Mars or Venus. Only with life continually producing
oxygen through photosynthesis and removing and re-circulating CO2 does Earth's atmosphere remain fairly stable.
This activity introduces students to the atmospheric differences between the three
"sister" planets in a graphic and hands-on way. Students need not memorize the chemical compositions and pressures of the three atmospheres; rather,
the activity should give them an overall appreciation of the important similarities
and differences. Students will use this understanding later as they begin to appreciate
the scope and importance of the greenhouse effect on earth and realize that rather
than being a bad thing, the greenhouse effect is critical for the survival of the
• Colored cotton balls, jelly beans, or different colored beans (or similar materials)
to represent gases in the atmosphere
• Re-sealable plastic bags
• Science notebooks
1. Discuss the "Goldilocks Principle." Use the information in Tables 1 and 2 to engage
the class in a discussion of the greenhouse effect. If available, you may want to
share illustrations or slides of Mars, Venus, and Earth.
2. After discussing the atmospheres of Earth and the other planets, ask the students
(in teams or pairs) to build models of the atmospheres of Earth and the other planets.
Emphasize that models are critical tools for planetary scientists trying to understand
phenomena too distant to experience directly
3. Depending on the material available, ask students to represent the atmospheric
gases with different colored beans, cotton balls, or jelly beans. (We will use jellybeans
for examples in this activity.) They might represent:
• Nitrogen (N2) with red jellybeans
• Oxygen (O2) with green jellybeans
• Argon (Ar) with purple jellybeans
• Carbon dioxide (CO2) with yellow jellybeans
• Methane (CH4) with white jellybeans
4. Representing atmospheric density with jellybeans is impractical - if Earth's atmosphere
has 100 jellybeans, Venus will have 9,000, and Mars will have slightly more than 1/2
jellybean (0.6). Suggest that the students use 10 or 100 as the base number for each
planet. Let the students know what the real differences in density are.
6. Challenge the students to produce a model atmosphere for each planet by placing
the appropriate number of jellybeans in three small, re-sealable plastic bags. The
necessary information is provided in Table 2. They will have to translate percentages
into numbers of jellybeans, and in many cases, will face the difficulty of cutting
the jellybeans into small enough pieces to represent small atmospheric concentrations.
7. Have students explain what they found to the class and write about it in their
8. To extend this activity, you could take one set of bags and distribute the contents
in areas measured to represent atmospheric pressure of each planet. For example, the
jellybeans representing Earth might be distributed in a meter square. You might have
to go outside to find an area big enough to represent the thin atmosphere found on
Mars. To concentrate the beans representing the dense atmosphere of Venus, you could
use a food processor or mortar and pestle to concentrate the jellybeans.
1. Have the students display their work in the classroom and allow time for them to
observe and discuss each other's work as you circulate.
2. Have students respond in writing to the following questions in their science notebooks:
• Describe the atmospheric conditions you might encounter as an astronaut setting foot
on Venus and Mars.
• Name at least two ways that the atmospheres of Venus and Mars are similar to each
other, and one way that both differ from Earth's.
•What new information did you learn in this lesson? What did you already know? What
was the hardest thing about the activity?
Developing and Using Models Activity #5: Measuring Albedo and Climate Modeling
Grades targeted: HS
General Objective: Students manipulate clouds, albedo and carbon dioxide within a computerized atmospheric
Students investigate and analyze each variables impact on global climate temperature.
Brief Details: Lessons leading up to this modeling activity: Students complete the
“Radiant Energy Lab” and “Reflection and Absorption Lab” as needed to build background
knowledge regarding energy conversion prior to this activity (lessons included within
the resources below).
Before launching the “Measuring Albedo Simulation” I also play a short NASA video
regarding Polar Ice Modeling.
1. In what ways did this activity change your beliefs about developing and using models?
2. How difficult do you find it to develop and use models?
3. Discuss your level of confidence along the process of developing and using models.
INTEGRATION OF THE CONCEPTS
1. How do you currently help students develop and use models of science phenomenon
in your classroom?
2. Review a recent lesson you taught and evaluate the effectiveness of engaging students
in developing and using models.
3. What is the relationship between this practice and others?
1. Ask a colleague to observe one of your lessons OR video yourself teaching and tally
the number of questions YOU ask and the number of questions STUDENTS ask.
2. Use the EQuiP Rubric for Lessons & Units: Science to evaluate a recent science lesson you taught.
Learning Progression for Developing and Using Models
Elementary: Students should be able to create “pictures” and or physical scale models to more
Middle School: Students should be able to use diagrams, maps and other abstract models as tools
that enable them to elaborate their own ideas or findings and represent them to others.
High School: Students should develop more sophisticated models as they progress through their
education and refine their models as their understanding develops. (Framework, pgs. 58-59)