Q2 What are the major forms of precipitation? Compare the forms of precipitation. How are they alike? Different? Compare water and air. How are they alike? Different?

Today’s Objective: I understand the pressure air exerts on Earth

The science or study of our atmosphere and its affect on our weather. Meteorology: The science or study of our atmosphere and its affect on our weather. Hyperlink picture to wild weather intro video

atmospheric conditions: The current atmospheric conditions: temperature, Wind humidity

What causes the weather? Weather is caused by the uneven heating of Earth’s surface.

Climate is the common, average weather conditions at a certain place over long periods of time.

Atmosphere: Layers of gas that surround the surface of a planet or satellite

The “push” of air in a certain area Air pressure The “push” of air in a certain area

Does the pressure the air exerts on us ever change?

When cooled: Gases like air takes up less space Water expands taking up more space

How Heavy is Air?

At sea level, atmospheric pressure is 14.7 pounds per square inch. A column of air 1 in2 weighs 14.7 lbs.

Barometer: measures atmospheric pressure Get off my back.... Barometer: measures atmospheric pressure

barometers Aneroid Barometer: Mercury Barometer: bar and millibar (mb) describe pressure. inches or mm of Mercury (in Hg).

Copy the pink data box on the right on your paper.

Is Air Stronger Than Gravity? How Strong Is Air? Is Air Stronger Than Gravity? 1) Fill the soda bottle to the top with water. 2) Push the ping pong ball onto the top to squeeze out a small amount of water.

3) Now, pour about one third of the water from the bottle into the graduated cylinder. Measure and record the amount of water in the graduated cylinder as V0. 

4) Hold the ping pong ball on top of the bottle and invert it over the beaker. Hold the ball loosely against the opening so that some water is allowed to leak past the ball into the beaker. Don't jiggle or rotate the ball during this process.

7) Eventually, enough water will leak out that the pressure on both sides of the ball will be the same—you can take your hand away and the ball will stay in place. Add the water that leaked out into the graduated cylinder. Measure and record this total amount as V1.

8) Measure the distance from the mouth of the bottle to the top of the water it encloses and record this distance as D. 9) Complete the calculations called for on your activity sheet to determine the atmospheric pressure in your classroom.

9. Substitute your measurements into the following equation and calculate P0, the atmospheric pressure. Show your work.  P0 = ρ * g * D [V1 / (V1 – V0)] 

Why do you think it took people a different number of times? Lab Analysis How many times did it take each person in your group to be successful? Why do you think it took people a different number of times?

What held the ping pong ball up in the air? What caused it to fall?

What are some variables that may have affected your results What are some variables that may have affected your results? What May have made Your results different from other groups?

Did everyone lose the same amount of water? Why? What tips were given by your group members on how to be successful? Did everyone lose the same amount of water? Why?