TAKE OUT PEN AND PAPER PREDICT – Think quietly to yourself OBSERVE – Write down three possible possible explanations EXPLAIN – Pair with the person next to you to come up with a solution LISTEN – With your partner, listen to the class and revise your explanations Observe the water and container. Think of your surroundings… How is this possible?

Smaller area means more pressure More force means more pressure SI Base Units for pressure = Pascals (Pa) Pascal = Newton/meter 2 (Force / area) Pressure = Force/Area

What are some examples of gas pressure being exerted? How could we change the amount of pressure being exerted? GAS PRESSURE IS AFFECTED BY… *Changing Temperature * *Changing Volume * Adding more gas (…more particles means more pressure)

Pressure and Volume – Boyles Law 1) How does the volume of the air in the dropper change as pressure is applied? 2) Is it a positive or negative relationship? 3) What would the graph of Pressure vs. Volume look like? With the person sitting next to you…draw the graph. Explain in your own words why it looks as it does.

Pressure vs. Volume

As pressure increases the volume decreases IF the temperature and amount of gas remain constant!!

Take out pen and paper There are many rough roads in the desert. 4x4 driving is a popular hobby for the people living there. Flat tires are part of the experience… Most flats occur in the afternoon and early evening. WHY?

Volume and temperature – Charles Law What would you expect the relationship of volume and temperature to be?

Charles Law – Volume and Temp. As temperature of a gas increases, the volume increases V T IF… The pressure is constant and the amount of gas does not change!!

Take out pen and paper 1) What variables change as the balloon rises? 2) How does each change affect the volume of the balloon. 3) How could you ensure that the balloon does not burst until the desired altitude? READ THIS: Weather balloons are used to collect data about the atmosphere and weather patterns.

BOYLES LAW Pressure vs. Volume P V CHARLES LAW Volume vs. Temperature V T

Combined Gas Law PRESSURE, VOLUME, and TEMPERATURE interact in predictable ways… So…if you know pressure and temperature… If you know volume and pressure… Can you think of any real-world applications of this knowledge?? P1V1 = P2V2 T1 T2