Behavior of Gases Chapter 3 Section 3
Let’s Review: • What is the definition of Volume? Amount of space something takes up • What is the SI Unit for Volume? m3, but we also use cm3, mL, L • What is the definition of Temperature? Average energy of motion of the particles of matter. • Higher Temperature means…?? Faster the particles are moving • What is the definition of Fluid Pressure? Total Force exerted by colliding particles over an area
Gas Pressure • Force of the gas particles divided by the area of the walls of the container. • As Gas Particles increases in a confined container = Pressure Increases What would happen if you opened the container and provided more volume for the gas particles? The pressure would decrease!
Draw a picture of a Volleyball. *Draw & Label the Gas Molecules inside + outside of the ball. *Label where you think there is Higher Pressure and where you think there is Lower Pressure.
Charles’s Law What happens to gas particles when temperature increases? The particles move… If they move faster, they move farther apart, which means… When the temperature of a gas is increased at a constant pressure, the volume ______________. When the temperature of a gas is decreased, the volume _____________.
How do Hot Air Balloons fly? The volume of the hot air increases when the temperature increases…making it less dense than the air outside!
Brain Break! With your partner, Create a riddle or analogy to help you remember Charles’s Law.
Boyle’s Law When the pressure of a gas at a constant temperature is increased, the volume of the gas ____________. When the pressure of a gas is decreased, the volume of the gas _____________. http://www.chem.iastate.edu/group/Greenbowe/sections/projectfolder/flashfiles/gaslaw/boyles_law_graph.html
Temperature & Pressure As Temperature of a gas INCREASES at a constant volume, Pressure INCREASES Why? Particles move faster and collide more frequently, like sand particles on a windy beach.