Air Pressure Demo Day!!!

Hlinka Science 2015

Air Pressure•What is it?

•Brainstorm…

•What was our definition??

Definition•Air Pressure:•- The amount of pressure in the

air above you.•This is also known as the

Barometric Pressure•That is 14.7 pounds per square

inch

Why are we studying AP?

•Why are we studying air pressure with weather?

•It is the difference in air pressures that causes movement and creates winds therefore WEATHER!!!

What does 14.7 psi feel like?

•Describe what the air pressure bar feels like?

Demo 1 • Water Glass Trick: cup, notecard, 1/3

cup water• A. Observations: record

observations: what did you see?• B. Hypothesis: Why do you think is

the reason this happened• C. Actual Science:

Science•The water inside the cup is

lighter than the air outside, the card is held in place by about 14.7 pounds of force from the air pushing up, while the force of the water pushing down is only about one pound of force.

DEMO 2• Cloud in a Bottle: Materials: clear

plastic pop bottle, matches and warm water

• A. Observations: record observations: what did you see?

• B. Hypothesis: Why do you think is the reason this happened

• C. Actual Science:

Science• Water vapor, water in its invisible

gaseous state, can be made to condense into the form of small cloud droplets. By adding particles such as the smoke enhances the process of water condensation and by squeezing the bottle causes the air pressure to drop. This creates a cloud!

Demo 3 •Flying paper: materials long thin

piece of paper•A. Observations: record

observations: what did you see?•B. Hypothesis: Why do you think is

the reason this happened•C. Actual Science:

Science• This is the same reason airplanes

can fly. As you blow across the top of the sheet, you lower the air pressure (because the air is moving faster), and thus the pressure on the underside of the sheet is now higher, and higher air pressure pushes the sheet upwards.

Demo 4• Water Balloon in a Bottle: materials

small water balloon, flask and match• A. Observations: record

observations: what did you see?• B. Hypothesis: Why do you think is

the reason this happened• C. Actual Science:

Science• Evacuate the air out and the difference

in pressure draws the balloon in.

• How do we get the balloon out?

• You need a straw and create greater pressure behind the balloon.

Demo 5• Blow up the balloon in a bottle:

materials balloon, flask• A. Observations: record

observations: what did you see?• B. Hypothesis: Why do you think is

the reason this happened• C. Actual Science:

Science•How do we get the balloon in the bottle?

•Evacuate the air out and the difference in pressure draws the balloon in.

Demo 6• Can Crusher: materials can, water,

Bunsen burner• A. Observations: record

observations: what did you see?• B. Hypothesis: Why do you think is

the reason this happened• C. Actual Science:

Science•Air takes up SPACE. We

evacuated the air by heating it up. Air rushed out and made the pressure lower on the inside.

•When we cooled the can the pressure on the outside crushed the can.

Demo 7• Kissing Balloons: materials two

balloons, string• A. Observations: record

observations: what did you see?• B. Hypothesis: Why do you think is

the reason this happened• C. Actual Science:

Science•Blowing between the balloons lowered the air pressure. The pressure of the surrounding air is now higher and it will push the balloons together.

Demo 8• Paper towel bet: 2 L bottle small

piece of paper towel• A. Observations: record

observations: what did you see?• B. Hypothesis: Why do you think is

the reason this happened• C. Actual Science:

Science•Air takes up SPACE!!

•There's no room for it, so it will flow right out, pushing away the paper ball.

Demo 9• Ping Pong Funnel: materials ping pong

ball, funnel: Can we blow it out? How can we lift the ping pong ball?

• A. Observations: record observations: what did you see?

• B. Hypothesis: Why do you think is the reason this happened

• C. Actual Science:

Science•As you blow into the funnel, the

air moves faster and lowers the air pressure underneath the ball. Because the air pressure is higher above the ball than below it, the ball is pushed down into the funnel—no matter how hard you blow or which direction you point the funnel.