2. Chapter 20 Review Gases

3. Why is mercury used in a barometer? It’s density. Mercury is a dense liquid. Tube only needs to be 76 cm.

4. How does a farm-type pump bring water to the surface? Pumping action creates low pressure in the pipe, which allows atmospheric pressure to push the water up to the top.

5. What is the maximum height that water can be raised by a vacuum pump? 10.3 m

6. What does a barometer measure? Atmospheric pressure

7. What two things does Boyle’s law relate? Pressure and Volume Pressure x Volume Before = Pressure x Volume After

8. What happens to the pressure in a beach ball when you compress it to 1/3 its original volume? Pressure increases three times

9. Is the pressure inside an inflatable toy greater or less than the pressure outside of it? Greater!!

10. What will happen to the density of a frog if it holds its breath and swims to the bottom of a pond? The frog’s density increases.

11. What happens to the frog’s weight? Stays the same

12. What is buoyant force equal to? The weight of fluid displaced.

13. What happens to the size of a bubble of air released from a submarine? It gets bigger. (less pressure on the way up)

14. What is the buoyant force on a two pound weather balloon? Two pounds

15. Where does the water flowing in a river move the fastest, at the narrow or wide part? Narrow part

16. What happens to atmospheric pressure on a breezy, stormy day? Decreases/drops

17. What does Bernoulli’s principle state about fluid pressure and fluid speed? Fast fluid = Low Pressure

18. When drinking from an inverted bottle, why do you reach point where you cannot get the liquid to come out of the bottle? Atmospheric pressure cannot push on the liquid.

19. What happens to a ribbon at the bottom of a fan that is turned on? It goes up due to Bernoulli’s principle.

20. What size wings would you want for a plane if you want more lift? Big wings

21. What causes a roof to come off a house during a hurricane? Low pressure outside, high pressure inside Bernoulli’s principle