1. Matter: States of Matter (Gas)

2. 3 States of Matter Solid Liquid Gas Plasma ***
Gas- How can you determine the mass of air?
Demo- Walking; Sugar & Water; Turbulence Tube

3. Gas
Takes the shape and volume of the container
Easily compressed

4. Gas Vs. Vapor
Gas and vapor are often used interchangeably, but there is a difference!!

5. Gas Vs. Vapor
Gas
Substances that exist in the gaseous state at room temperature.
Vapor
A substance that is currently a gas, but normally is a liquid or solid at room temperature.

6. Gas Vs. Vapor
Which is correct: “water gas”, or “water vapor”?

7. Kinetic refers to motion
Gas
Kinetic refers to motion
Kinetic energy - energy an object has because of it’s motion
Kinetic theory - tiny particles in all forms of matter are in constant motion!

8. Gas #1. Gas is composed of particles
Small, hard spheres
Insignificant volume; far apart from each other
#2. Particles in a gas move rapidly in constant random motion
#3. Collisions are perfectly elastic- meaning K.E. is transferred without loss from one particle to another

9. Kinetic Energy and Temperature
Kinetic Energy is related to temperature. The faster something is moving, the higher the temperature, the higher the K.E. that particle has.
Please rate the following from least to greatest amount of K.E.
Steam
Water
Ice

10. Pressure Gas Pressure – Force (F) of a gas per unit surface area
Due to:
F of collisions
# of collisions
No particles present = no collisions no pressure (a.k.a. vacuum)

11. Pressure
Atmospheric pressure results from the collisions of air molecules with objects
↓as you climb a mountain because the air layer thins out as elevation increases

12. Pressure The SI unit of pressure is the pascal (Pa) Other units: mm Hg
kPa
mm Hg
atmospheres (atm)