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# Copy of AIR PRESSURE: WHAT IT'S LIKE TO BE UNDER PRESSURE

How did air pressure factor in to the mini-labs :)
by

## brian ward

on 21 February 2013

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#### Transcript of Copy of AIR PRESSURE: WHAT IT'S LIKE TO BE UNDER PRESSURE

UNDER PRESSURE...HOW DID THE
MINI-LABS WORK?? RED CUP: Air molecules got pushed out of cup through the hole by water molecules.

Why do you think
air pressure in cup = air pressure outside of
cup? 1. Q-TIP DIVER YELLOW CUP: Air molecules pushed out the side of the cup and water molecules come in through the side.

Why do you think
air pressure in cup = air pressure outside of
cup? GREEN CUP: Air molecules got trapped in
the cup as it was pushed deeper into the
water molecules. Water molecules
never made it inside the cup. Air molecules kept
water molecules from coming inside.
Air pressure inside the cup is MORE THAN air
pressure outside the cup

Why?

What happens to the air pressure INSIDE
the cup as you keep pushing it DEEPER? WHEN THE AIR UNDER THE BAG WAS HEATED, THE
MOLECULES MOVED......... 2. FLOATING BAG FASTER.....SO AS THEY FLEW AROUND IN THE BAG,
PUSHING AGAINST THE SIDES, THE AIR IN THE BAG WAS..... LESS DENSE THAN THE COOLER AIR OUTSIDE THE BAG.

THIS SHOULD TELL YOU 2 THINGS ABOUT HOT AIR:
1. IT'S ________ ______________ THAN COLD AIR
2. ____________ ______________ AIR TENDS TO GO___________ WHEN YOU TRY TO BLOW THE PAPER WAD INTO THE
BOTTLE LIKE YOU'RE BLOWING OUT BIRTHDAY CANDLES
(QUICK AND STRONG) THE AIR PRESSURE (FORCE OF AIR
MOLECULES PUSHING ON THINGS) IS MORE INSIDE THE
BOTTLE THAN OUTSIDE...SO, 3. PAPER IN THE BOTTLE THE PAPER WAD FLIES BACK AT YOU :)
IF IT DOESN'T, YOU WEREN'T BLOWING OUT
BIRTHDAY CANDLES (TO WEAK AN EFFORT) LOOK IN YOUR JOURNAL:
SCI - WHY:

BIG BUBBLE and DRY BUBBLE:
First, write the definition of Surface Tension: Second, write the definition of air pressure: The air pressure caused by the added volume of gas
(either Carbon Dioxide or Natural Gas) on the surface tension of the water.

If the bubbles float, the gas must be ____ ____ than the surrounding air. CUP AND THE CARD:
The force of the air pressure of molecules was
GREATER outside the cup than in......so the card
was PUSHED by the outside gas molecules.

THE FLAME COULD NOT BURN IT BECAUSE
THE WATER PREVENTED THE FLAME FROM GETTING
1. Oxygen
2. Reaching the kindling point (temperature hot enough
for combustion...burning). 5. NOW, FOR SOME OTHER
THINGS YOU SAW: CAN YOU FIGURE OUT, BASED
ON ALL THESE
THINGS YOU DID,
GAS MOLECULES IN AIR SEEM
TO WANT TO TRAVEL FROM
_________ PRESSURE to
_________ PRESSURE

WHICH MEANS AIR LIKES TO GO
FROM ____________ PRESSURE
TO _____________ PRESSURE. EGG DROP:
By heating the inside of the flask, the air molecule
pressure INSIDE was ______________ than the air
molecule pressure OUTSIDE......go back to #2, the
FLOATING BAG to see this!
The Egg was just being PUSHED by the gas molecules in
the air :) NEWSPAPER CATAPULT:
By flattening the newspaper out overtop of the ruler,
you pushed out as many gas molecules as you could.
So.......the air pressure of gas molecules ABOVE the ruler
and paper was _________________than the air pressure of gas molecules BELOW the ruler and paper.
When you hit the ruler, it was like ruler was being put against
THOUSANDS OF POUNDS of air pressure all at once....it had to SNAP!!! When you hit it the first time, you didn't do anything special with the newspaper,
so the ruler flew up and shot the papers everywhere.
Air Pressure ABOVE the paper was EQUAL to air pressure BELOW the newspaper.
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