Air Pressure Test§

Question 1

Why don’t we feel air pressure even though it is all around us

Answer 1

Because air pressure moves all around us

Question 2

Briefly describe how an aneroid and Mercury barometer indicate air pressure

Answer 2

Both measure air pressure, it is measured in millibars, and in a Mercury barometer of the air pressure increases then the Mercury will rise

Question 3

What is wind

Answer 3

Wind is the horizontal movement of air due to differences in air pressure

Question 4

How is wind created

Answer 4

Wind is created by air(which acts like fluid) and moves away from one area of high pressure to an area with low pressure(H»L)

Question 5

What is air pressure

Answer 5

Pressure exerted by the weight of the air above us

Question 6

What are the three factors that control air

Answer 6

• pressure differences
• friction
• and the coriolis effect

Question 7

Describe pressure difference

Answer 7

A greater pressure difference means greater wind speeds

Also called pressure gradien

Question 8

Describe friction

Answer 8

This happens close to earths surface, friction slows air movement
Rugged terrain-(mountains) higher friction so slower wind
Smoot terrain-(ocean) lower friction so wind moves faster

Question 9

Describe the coriolis effect

Answer 9

The earths rotation affects the movement of all fluid(like air). This affects wind direction only

Question 10

What is a jet stream, which direction do they move

Answer 10

Jet streams are fast moving rivers of air near the tropopause, that run east to west parallel to isobars at high speeds of 75-150mph

Question 11

What does the simple act of identifying pressure centers(low and high) tell you about weather in the areas of that pressure center

Answer 11

It allows us to predict the weather

Question 12

What does a low pressure center predict

Answer 12

Cloudy and precipitation

Question 13

What does a high pressure system predict

Answer 13

Clear skies and fair weather

Question 14

In the north hemisphere what direction is the wind at a low

Answer 14

They blow counterclockwise at a low center

Question 15

In the north hemisphere what direction does the wind blow at a high

Answer 15

They blow clockwise at a high center

Question 16

What is the predominant force that determines these directions

Answer 16

The coriolis effect

Question 17

In the Southern Hemisphere what direction does the wind blow at a low

Answer 17

They blow clockwise at a low center

Question 18

In the Southern Hemisphere what direction does the wind blow at a high

Answer 18

They blow counterclockwise at a high center

Question 19

Which is associated with stormy weather, rising or sinking air

Answer 19

Idk

Question 20

What is global winds

Answer 20

It is winds that blow from a specific direction over long distances

Question 21

How are global winds created

Answer 21

They are made by unequal heating of the earths surface leading to different pressure systems

Question 22

How does the unequal heating of tropical and polar regions contribute to global winds

Answer 22

Tropical regions have more solar radiation received than radiated back to space, and polar regions have less solar radiation received than radiated back to space

Question 23

What is local winds

Answer 23

They are winds that blow short distances and are produced by a locally generated pressure difference

Question 24

How are wind direction and speed measured

Answer 24

An anemometer measures wind speed, and a wind vane indicates wind direction

Question 25

What is a prevailing wind

Answer 25

They are winds that are constantly blowing from one direction more than any other.

Question 26

What is the prevailing wind in the U.S.

Answer 26

Mid-latitude westerlies

Question 27

In the north hemisphere what direction is the wind at a low

Answer 27

They blow counterclockwise at a low center

Question 28

In the north hemisphere what direction does the wind blow at a high

Answer 28

They blow clockwise at a high center

Question 29

What is the predominant force that determines these directions

Answer 29

The coriolis effect

Question 30

In the Southern Hemisphere what direction does the wind blow at a low

Answer 30

They blow clockwise at a low center

Question 31

In the Southern Hemisphere what direction does the wind blow at a high

Answer 31

They blow counterclockwise at a high center

Question 32

Which is associated with stormy weather, rising or sinking air

Answer 32

Idk

Question 33

What is global winds

Answer 33

It is winds that blow from a specific direction over long distances

Question 34

How are global winds created

Answer 34

They are made by unequal heating of the earths surface leading to different pressure systems

Question 35

How does the unequal heating of tropical and polar regions contribute to global winds

Answer 35

Tropical regions have more solar radiation received than radiated back to space, and polar regions have less solar radiation received than radiated back to space

Question 36

What is local winds

Answer 36

They are winds that blow short distances and are produced by a locally generated pressure difference

Question 37

How are wind direction and speed measured

Answer 37

An anemometer measures wind speed, and a wind vane indicates wind direction

Question 38

What is a prevailing wind

Answer 38

They are winds that are constantly blowing from one direction more than any other.

Question 39

What is the prevailing wind in the U.S.

Answer 39

Mid-latitude westerlies