Chapter 20 Review Gases

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

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.

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

What does a barometer measure? Atmospheric pressure

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

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

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

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.

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

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

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

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

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

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

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

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.

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

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

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