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Chapter 10 (Test 3)
Terms in this set (34)
What is pressure?
Force per unit area
Atmospheric pressure at a specific location and height level is determined by ______.
the weight of air above
Hydrostatic relations is?
pressure gradient force is in balance with gravity which means no vertical motion initially.
Pressure always _______ with increasing height.
In the low atmosphere, pressure decreases by about ___ mb (hPa) for every 100 m increase in elevation
____ can change as we go up or down in the atmosphere.
When a column of air is cooled, it _____.
When a column of air is heated, it _______.
When a column is heated or cooled, what happens to the surface pressure?
The surface pressure remains the same since the column still contains the same mass of air.
When a column is heated or cooled, what happens to the level of the mb surface?
The level of the surface changes. If heated, it moves upward. If cooled, it moves downward.
Air moves from high to low pressure in middle of column, causing _____ ______ to change.
How does the atmosphere convert heating into motions?
1) Start w/ uniform atmosphere at rest
2) Differential heating causes different rates of expansion in air columns
3) Differing rates of expansion result in pressure differences along a horizontal surface.
4) Pressure differences then induce flow.
Heating or cooling of air column can establish ____ _____ in pressure that cause the air to move horizontally.
Many scales record atmospheric pressure using ____ and ___.
inches of mercury (Hg) and millibars (mb).
The national weather service uses mb, but will convert to metric units of _______.
The conversion of hPa is?
1 hPA = 1 mb
What is station pressure?
the pressure reading at a particular location and elevation.
What is sea level pressure?
the pressure adjusted to altitude 0 m, which is the mean sea level.
Pressure drops approximately ____ mb for 100 m increase in height.
_______ ______ surface station pressures are used to construct sea level pressure contours on the surface maps. The contours are often smoothed and simplified to ease interpretation.
Near surface in the northern hemisphere, winds blow _______ around and towards a low pressure center.
Near surface in the northern hemisphere, winds blow _____ around and outwards from a high pressure center.
What does isobaric mean?
A low 500 mb height indicates _____ air below, and less atmosphere and lower pressure above.
At constant pressure surface, height contours are plotted and higher heights correspond to higher_____.
At upper levels, winds blow _____ to the height contours in wavy _____ to _____ direction.
parallel; west to east
What is pressure gradient force?
the force caused by horizontal pressure difference.
How do you calculate pressure gradient force?
Pressure gradient force = changes in pressure per changes in distance.
PGF= (1/p) * (Change in P/d)
What force causes wind to blow?
Pressure gradient force
The pressure gradient force is directed from ___ towards ___ pressure at right angle to the isobars.
higher towards lower
The PGF is directly related to the _____
The changes of pressure over a given distance (change in P/d)
Steep pressure gradient corresponds to _____ pressure gradient force and high wind.
The ____ the pressure contours on the weather map, the larger the PGF, the higher the wind speed.
Atmospheric pressure is?
the pressure exerted by the mass of air above a region.
THIS SET IS OFTEN IN FOLDERS WITH...
GEOL 1350 Test 3
Chapter 9 (Test 3)
Chapter 11 (Test 3)
Chapter 12 (Test 3)
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