The Air Around Us Investigation 2, Part 1 -edited for Website Where’s the Air? The Air Around Us Investigation 2, Part 1 -edited for Website TG-P.57-70

Air Weather happens close to the earth’s surface or Troposphere. We live surrounded by air, a mixture of gases. TG-P.71

Air plays a very important role in the weather Weather Tools First investigation To measure weather conditions Air plays a very important role in the weather TG-P.71

The Experiment Investigate air with your shoulder partner using a tube and giant syringe Do not: use your syringe to annoy another student point either end of the syringe at another student TG-P.71

Questions As 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? TG-P.71

Air Investigations (Lab Handout) 3 Part Investigation 3 Observations 3 Questions TG-P.71 Student Lab Notebook-P.3

The Experiment What happens to the air in the syringe… … when you push and pull on the plunger? Add a binder clip? TG-P.71 Student Lab Notebook-P.3

Results The air is pushed into a smaller space When you clamp the tube closed and push the plunger down what happens to the air? The air is pushed into a smaller space TG-P.71-72 Student Lab Notebook-P.3

Observations The air pushes the plunger back up What happens when you let go of the plunger after pushing it down? TG-P.71-72 Student Lab Notebook-P.3 The air pushes the plunger back up

more air less air the same amount Results Is there more air less air the same amount of air in the syringe when the air is pushed into a smaller space? TG-P.71-72 Student Lab Notebook-P.3 The Same Amount

Observations What 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? TG-P.71-72 Student Lab Notebook-P.3

Compression Air forced into a smaller space The air (same amount) was compressed TG-P.71-72 Student Lab Notebook-P.3

Compression and Pressure Compressed air… Pushes back with a force equal to the force compressing it TG-P.72 Student Lab Notebook-P.3 Compressed air will push the plunger out Pressure is the push back of compressed air

Conduct an Experiment What happens? Why does this happen? Gets smaller The air inside the foam is being compressed TG-P.72 Student Lab Notebook-P.3

Compression MultiMedia View the “Gas in a Syringe” animation Gas in a Syringe model TG-P.73 Student Lab Notebook-P.3 Use the FOSS Weather and Water CD-ROM to show “Gas in a Syringe” animation.

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 TG-P.73 Student Lab Notebook-P.3

Compression and Air Volume of air Is compressed into a smaller space The same number of molecules are pushed closer together Molecules bump into each other more Pressure pushes in all directions TG-P.73

Our Question Does air have weight? Does air have mass? TG-P.73

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 substance Can vary slightly at different places in Earth Can vary greatly on different planets TG-P.73

Prove It! Does air have mass? Available materials for use: -balloons - tape - plastic zip bags - paper clips - string - clear straws TG-P.74 Safety Tip- Be sure to check for student Latex Allergies before distributing balloons!! The balloons in kit are made of Latex! Lab Notebook

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) TG-P.74 Safety Tip- Be sure to check for student Latex Allergies before distributing balloons!! The balloons in kit are made of Latex! Student Lab Notebook P.3

Reading Turn to p. 6 in text Read “What’s in the Air?” Answer the questions on the bottom of pg. 3 lab worksheet. Resource Book- P.6

Ticket Out To 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.