where’s the air? the air around us investigation 2, part 1 -edited for website
TRANSCRIPT
Where’s the Air?The Air Around Us
Investigation 2, Part 1-edited for Website
AirWeather happens close to the earth’s surface or
Troposphere.
We live surrounded by air, a mixture of gases.
Weather Tools
First investigation
To measure weather conditions
Air plays a very important
role in the weather
The Experiment
Investigate air with your shoulder partner using a tube and giant syringe
Do not:use your syringe to annoy another studentpoint either end of the syringe at another
student
QuestionsAs you work with the syringe answer the
following questions:What happens to air in the syringe when you
push and pull on the plunger?What can air do?
Air Investigations (Lab Handout)
3 Part Investigation
3 Observations
3 Questions
The Experiment
… when you push and pull
on the plunger? Add a
binder clip?
What happens to the air in the syringe…
When you clamp the tube closed and push the plunger down what happens to the air?
The air is pushed into a smaller space
What happens when you let go of the plunger after pushing it down?
The air pushes the plunger back up
Is there
more air less air the same amount of air in the syringe when the air is pushed into a smaller space?
ObservationsWhat do you think happens to the air when it is
pushed into a smaller space?
What happens to push the plunger back out when you release pressure on the plunger?
Compression
Air forced into a smaller space
The air (same amount) was compressed
Force
Compression and Pressure
Compressed air will push the plunger out
Pressure is the push back of compressed air
Pushes back
Compressed air…
with a force equal to the force compressing it
Conduct an Experiment
What happens? Gets smaller
Why does this happen? The air inside the foam is being compressed
Compression MultiMediaView the “Gas in a Syringe” animation
Gas in a Syringe model
What is the air made of?Everything is made of atoms, including air
Molecules of gases move around freely
There is a lot of space between molecules of gases
Compression and Air
The same number of molecules are pushed closer together
Molecules bump into each other more
Volume of air
Is compressed into a smaller space
Pressure pushes in all
directions
Our QuestionDoes air have weight?
Does air have mass?
Weight?How can we confirm that something has mass?
We can weigh it
Weight - pull or force between Earth and the matter in an object or substanceCan vary slightly at different places in EarthCan vary greatly on different planets
Prove It!Does air have mass?
Available materials for use:
-balloons - tape
- plastic zip bags - paper clips
- string - clear straws
Prove It!In your group design an experiment to show air
has mass.
Use 1 Science Buddies sheet, but all members contribute. Write name in the box you wrote.
Use your metacognitive skills. (Think about your thinking)
ReadingTurn to p. 6 in text
Read “What’s in the Air?”
Answer the questions on the bottom of pg. 3 lab worksheet.
Ticket OutTo leave today, on a half sheet of paper,
complete the following.
Three key
points from your
learning.
One concept that I am square with.
(completely understand)
Write a question
that is still rolling
around in your head.