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

6. Boyle’s Law a. The volume of a gas varies inversely with its pressure if temperature remains constant. b. P1 P1 V 1 = P2 P2 V2V2 Volume of the gas inside the cylinder will decrease Pushing the plunger down will increase the pressure

7. Charles’s Law a. The volume of a gas varies directly with its temperature if pressure remains constant. b. V1 V1 / T 1 = V2 V2 / T2T2 A balloon shrinks when submerged in cold water

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