1. Bell Work: Gasses
List 10 things you know about gases. . . anything you can think of related to a gas.

2. Gas Laws

3. Remember: P = Pressure: force/area
Units: Pa, kPa, atm, torr, mmHg, N/m2
V = Volume: space an object takes up
Units: L, mL, m3, cm3, dm3
T = Temperature: measure of kinetic energy
Units: K, C

4. There are LOTS of gas laws with formulas.
When solving gas law problems, to pick the correct formula you must look at the variables changing AND what is held constant!

5. Boyle’s Law pressure vs. volume
Volume is inversely proportional to pressure.
This means if one goes up, the other goes down. V P

6. Boyle’s Law Formula:
demo
P1V1 = P2V2

7. Boyle’s Law Graph

8. Charles’ Law volume vs. temperature
Volume is directly proportional to it’s Kelvin temperature.
This means if one goes up, so does the other. V T

9. Charles Law formula
demo
V1 = V2
T1 T2

10. Kelvin Temperature must be in Kelvin.
0 on the Kelvin scale is known as absolute zero.
Absolute zero is the lowest temperature that can exist.
At absolute zero:
kinetic energy = zero

11. How is Kelvin temperature found from Celsius temperature?
K = °C + 273
Write on your paper:
Practice: Convert 20°C to Kelvin
20°C = 293 K

12. What is the Celsius temperature of absolute zero?
K = °C + 273
0 K = x + 273
-273°C = x

13. Charles’ Law Graph

14. Combined Gas Law formula:
P1V1 = P2V2
T T2
Make sure to use the Kelvin temperature and cross-multiply to solve these problems!

15. Combined Gas Law
involves pressure, volume, and temperature
combines Boyle’s Law and Charles’ Law