Gas pressure is caused by collisions of gas particles with surfaces. Boyle's Law states that the volume of a gas varies inversely with pressure if temperature remains constant. Charles's Law specifies that gas volume varies directly with temperature if pressure remains constant. Gay-Lussac's Law describes pressure varying directly with temperature when volume is kept constant.

1. G. Behavior of Gases 1. Gas pressure is caused by collisions of gas particles on surfaces. 2. Pressure is measured in pascals . 3. 1 Pa = 1 N / m^2 4. Standard air pressure at sea level is 101.3 kPa … this is the same pressure as a big truck (14.7 pounds / sq. inch). 5. We normally use “atm” for problems

2. 6. Boyle’s Law a. The volume of a gas varies inversely with its pressure if temperature remains constant. b. P 1 • V 1 = P 2 • V 2 Volume of the gas inside the cylinder will decrease Pushing the plunger down will increase the pressure

3. 7. Charles’s Law a. The volume of a gas varies directly with its temperature if pressure remains constant. b. V 1 / T 1 = V 2 / T 2 A balloon shrinks when submerged in cold water

4. 8. Gay-Lussac’s Law Pressure varies directly with temperature if volume remains constant. Don’t throw it in a fire!