Atmospheric Pressure And Winds

Front 1

sea breeze

Back 1

sea breeze- local wind that forms like explination earlier. during daytime,coastal land is warmer than the nearby water. the air just above the land becomes warmer than the air over the water,pressure lowers on the landleading to pressure gradient betweenthe ocean and land.

Front 2

land breeze

Back 2

at night, land cools faster than water, air pressure over the land becomes higher. resulting pressure gradient causes the cool land breeze to blow to sea.

Front 3

Pressure-gradient force

Back 3

speed of the wind depends on the pressure gradient. the lower the pressure,the stronger the pressure gradient, the stronger the wind.

Front 4

valley winds

Back 4

during daytime, warm air rises from mountain slops. the rising air forms a valley breeze that blows up from the valley. wind speed less than mountain breeze.

Front 5

Coriolis effect

Back 5

bowling ball and spinning earth..the rotating earth causes things to go off course even though they are going in a straight line.

Front 6

What is pressure and what causes it?

Back 6

weight of the atmosphere per unit area. Air pressure is equal in all directions because the molecules in the gases have have equal force being placed on them, so the pressure on any surface is the same.

Front 7

how do Aneroid barometers work?

Back 7

measures pressure within a thin metal can. pumping most of the air out of the can, it is made sensative to air pressure. spring keeps can from collapsing forward. as the shape of the can changes in air pressure a pointer attached to the canmoves over a scale.

Front 8

how do mercury barometers work?

Back 8

mercury-at sea level mercury is 30 inches high in the column. space about mercury is a vaccum and when pressure increasesthe mercury clolumn rises.

Front 9

how does the temp of the atmosphere affect surface area pressure?

Back 9

Warm air is lighter than cold air beause molecules of warm air are farther apart. when warm air replaces an equal amnt of cold air the pressure at the ground falls. vis versa

Front 10

mountain winds

Back 10

at night cold,heavy air sinks into the from mountain tops into valleys.the narrower the valley the stronger th breeze.called a moutain breeze when coming from the mountain.

Front 11

relationship between air pressure and wind.

Back 11

when the ground heats faster than the water, the air above the island becomes warmer.molecules in the air become far apart so the air expands upward and outward.expansion lowers the air pressure at ground. this pressure gradient provides the force that makes wind blow

Front 12

how is air pressure affected by height.

Back 12

air pressure drops with height. barometer drops 1 cm/123 meters above sea level,which applies only to the first kilometers of air near the surface

Front 13

What are the two units of measure used for air pressure?

Back 13

millibars- equals about one thousandth of standard seal elvel pressure. standard sea level pressure is 1013.2 millibars (29.92 in)
inches- height of the mercury in the column.

Front 14

how many millibars in a inch? inches in a millibar?

Back 14

millibars in a inch- 34 mb
inches in millibar-0.03 in.

Front 15

explain the effect of humidity on air pressure.

Back 15

the more water vapor the air contains the lighter it is, so it exerts less pressure.

Front 16

pressure gradient

Back 16

when isobars are far apart the air pressure changes slowly. iso bars close together have a steep/strong gradient. isobars far away have a weak pressure gradient.

Front 17

Isobars

Back 17

lines that join points having the same air pressure at a given time.

Front 18

High pressure area

Back 18

The set of closed isobars surrounding th high pressure center.

Front 19

Low pressure area

Back 19

the inside isobar has the lowest reading.