Atmospheric Pressure Flashcards
Atmospheric Pressure
The weight of a column of air contained in a unit area from the mean sea level to the top of the atmosphere
Atmospheric Pressure is measured in?
force per unit area
Atmospheric Pressure is expressed in?
expressed in ‘milibar’ or mb unit
measured by ?
by -aneroid barometer
or
mercury barometer
In lower atmosphere, pressure _______ with height ?
declines :
In lower atmosphere, pressure declines rapidly with height.
The vertical pressure gradient force is much larger than?
horizontal pressure gradient :
- vertical pressure gradient force is much larger than that of the horizontal pressure gradient
- & is commonly balanced by an almost equal but opposite gravitational force
Low-pressure system is encircled by?
Low-pressure system is encircled by one or more isobars with the lowest pressure at centre.
High pressure system is encircled by ?
High pressure system is also encircled by one or more isobars with highest pressure in centre.
Isobars are?
lines connecting places having equal pressure.
pressure gradient is?
the rate of change of pressure in regard to distance
There are __ pressure belts.?
7 pressure belts.
7 pressure belts are?
1 Equatorial low,
2 Sub-Tropical highs (in North and South),
2 Sub-polar lows (in North and South),
& 2 Polar highs (in North and South)
Equatorial low ?
- it is found near the equator.
- The sea level pressure is low.
Subtropical high ?
The region in 30 degrees North and 30 degrees South, which are high-pressure areas.
Sub-polar Lows ?
The region in 60 degrees North and 60 degrees South, which are low-pressure belts.
