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# Investigation 3.3 - Air as Particles

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by

## Brooke Fox

on 16 November 2018

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#### Transcript of Investigation 3.3 - Air as Particles

Gases are composed of individual particles.
(1)

The particles are
not connected
to one another, and they move through space freely, traveling in straight lines until they run into something
Continue in
one
direction until they
collide
with something and bounce off
Gases
Gases
(2) Air
is the name of the mixture of gases that form Earth's atmosphere.
It is mostly
nitrogen
gas particles (N2)
There is also
oxygen
, a few
argon
, a few
carbon dioxide
, and
water
particles
Air
Gas particles are really, really small
A cubic centimeter of air (about the size of one of the small cubes) contains 27 million million million particles.
(3)
That's
27 quintillion particles
!
Size
Particles of gas are fairly far apart.
(4)
If the air particles in this room were the size of
, they would be 2.3 meters or
7.5 feet
apart.
(5)
They also move very fast - about
670 mph
!
Distance
(6) Nothing. Void.
There is just space between air particles, no matter.
(7)
ALL gases have
space/nothing
between the particles!
(8)
Because gas particles are pretty
far apart
, and there is only
space
between them, they can be
forced
together
What is between the air particles?
As particles in the gas get pushed closer and closer together, they hit the plunger more frequently
The harder you push, the harder they push
Pretty soon you reach a limit to how close together you can push the air particles.
Why Can't You Push the Particles Until they Touch?
(10)
Can all gases be compressed?
YES -- Name some gases that can be compressed!
When you stop applying force to the syringe plunger,
(9)

the air particles inside the syringe push up on the plunger and it moves out of the syringe barrel
It moves back until the pressure is equal again
27,000,000,000,000,000,000
Today You Need:
- A sharpened pencil
- A note sheet from the front table

* TURN in HOMEWORK (Air in a Syringe)
Foam Cube Lab
Closed-Cell
Open-Cell
Filled with thousands of tiny bubbles
Each sealed and separated from the other bubbles
Filled with bubbles that are connected to one another
The bubbles make channels that run through the cube
Full transcript