1. Ch. 3 - Fluids Sec. 2 - Pressure1 Pressure Slide Show #2

2. Ch. 3 - Fluids Sec. 1 - Pressure2 Matter Matter is anything that has mass & volume! Matter is made up of atoms!

3. Ch. 3 - Fluids Sec. 1 - Pressure3 Fluids A fluid is anything that flows. Fluids change shape easily. Liquids and Gases are fluids.

4. Ch. 3 - Fluids Sec. 1 - Pressure4 Fluid Pressure (No notes needed for this) All forces exerted by individual molecules add together to make up total pressure of fluid!! Air exerts pressure all around us

5. Ch. 3 - Fluids Sec. 1 - Pressure5 Pressure Atoms have mass & weight. So, matter has mass & weight. So, solids, liquids, and gases have weight. Weight is a force. So, anything that exerts a force over an area exerts pressure. (No notes for this…just know that pressure can be exerted by solids, liquids, and gases.

6. Ch. 3 - Fluids Sec. 1 - Pressure6 How do you calculate pressure? Pressure = Force/Area Force is measured in Newtons (N). Area is measured in squared meters (m 2 ) Pressure is measured in N/ m 2 Instead of N/ m 2, we can use The Pascal (Pa) 1 Pa = 1 N/ m 2

7. Ch. 3 - Fluids Sec. 1 - Pressure7 Pressure Pressure is from the word press. It refers to a force pressing on a surface. Which shoe exerts more pressure???

8. Ch. 3 - Fluids Sec. 1 - Pressure8 How can you change pressure? Increase pressure by: Increasing force Decreasing area. Decrease pressure by Decreasing force. Increasing area.

9. Ch. 3 - Fluids Sec. 1 - Pressure9 Would it make a difference if there was only one nail?

10. Ch. 3 - Fluids Sec. 1 - Pressure10 Fluid Pressure decreases with altitude As you go up in altitude, pressure around you decreases. The air is thinner.

11. So, why do your ears “pop” when you increase altitude? There is a difference in pressure Air pressure drops as you increase altitude. Pressure outside > Pressure inside of ear

12. Ch. 3 - Fluids Sec. 1 - Pressure12 Fluid pressure increases with depth! The deeper you go in a fluid, the more pressure surrounds you.

13. Imagine if this balloon is like your lung.

14. Ch. 3 - Fluids Sec. 1 - Pressure14 So…. Why do camels have large feet? (Large area to walk on sand. Less pressure). Why is it better to sleep on a bed rather than the floor? (More area of coverage, less pressure on your back)! So why are walls of dams thicker at the bottom than at the top? (Pressure increases with depth. Dams have to be reinforced) Why do excessive wear of high-heel shoes cause back and leg pain? (All of your weight is over a small area. More pressure on your back).