Air Pressure Demo Day!!! Hlinka Science 2015. Air Pressure What is it? Brainstorm… What was our definition??

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Presentation transcript:

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.