NC Essential Standard Compare the composition properties and structure of Earths atmosphere to include mixtures of gases and differences in temperatures and pressure within layers There are ID: 490550
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Slide1
LAYERS OF THE ATMOSPHERE
NC Essential Standard:
Compare the composition, properties, and structure of Earth’s atmosphere to include: mixtures of gases and differences in temperatures and pressure within layers.Slide2
There are
5
layers of the atmosphere.Slide3
TROPOSPHERE (4-12 miles)
All weather and the air you breathe!
The lowest and most important layer.
Contains 90% of all the gas molecules in the atmosphere!
Why?Slide4
TROPOSPHERE
Temperature is highest at the surface of the earth and decreases with altitude.
High altitude, colder temperatures
Low altitude, warmer temperaturesSlide5
TROPOSPHERE
The Sun sends solar radiation through the atmosphere in the form of electromagnetic waves.
Rock, soil, and water absorbs the Sun’s light and radiates it back as heat
.Slide6
TROPOSPHERE
As you move further from the ground, you are moving further from the source of this reflective heat.
Also, there are less molecules in the air as you increase in altitude.
Less molecules
= less collisions
= less heatSlide7
S
TRATOSPHERE (20-31 miles high)
Second layer of the atmosphere
Contains the ozone layer that helps to trap heat in the atmosphere.
As you increase in altitude,
temperature increases.
Warm air sits above cool air = stable
= no weather.
How is this different than the troposphere?Slide8
STRATOSPHERE
The pilot says, “We are no at our cruising altitude of 30,000 feet.” Why do planes fly so high in the air?
Out of the troposphere and
into the stratosphere
.
Fuel costs are lower because there is less friction due to the
lower air density
…there’s also less turbulence.Slide9
M
ESOSPHERE (31-53 miles high)
Middle layer
Temperature decreases with altitude (heat is from the stratosphere)
Extremely
low density of
molecules
Meteor showers occur hereSlide10
MESOSPHERE
The
pressure is so low that liquids would boil at normal body temperature.
Your blood would
boil
without a space suit!Slide11
MESOSPHERE
Thinking Question!
If pressure decreases with altitude…and your blood would boil in the mesosphere….
Does water boil faster in
the mountains or at sea level?
Answer: The MountainsSlide12
THERMOSPHERE
(53-430 miles high)
Fourth layer of atmosphere from the surface of the earth.
Very low density of
molecules
The
gases of the thermosphere are increasingly thinner than in the mesosphere. As such, only the higher energy ultraviolet and x-ray radiation from the sun is absorbed. But because of this absorption, the temperature increases with height and can reach as high as 3,600°F (2,000°C) near the top of this layer.
However, despite the high temperature, this layer of the atmosphere would still feel very cold to our skin because of the extremely thin air. The total amount of energy from the very few molecules in this layer is not sufficient enough to heat our skinSlide13
EXOSPHERE
(430 miles to
outerspace)
Outermost
layer of the atmosphere. Slide14
SUN
* Source of all of the energy on Earth.
* Energy from the sun must pass through the different layers of the atmosphere before it hits the surface. Slide15
Temperature Pattern
The atmosphere is divided into different layers based on the shifts in the temperature increasing or decreasing with altitude.
It is a pattern!!Slide16
Air Pressure & Density
Air pressure and density DECREASE as you increase in altitude (less air the further up you go!).Slide17
Density
Density:
the amount of molecules (mass) in a given volume of substance.Gravity pulls molecules down to Earth!Slide18
ATMOSPHERIC or
AIR
PRESSURE
=
The force of the air weighing down over a
unit
of area
.Slide19
Atmospheric Pressure
Air molecules constantly bounce off each other and push on all the surfaces they touch.
The amount of pressure exerted by our atmosphere is about 14.7 pounds per square inch.
Why don’t you feel it?
All the air and liquids in your body push outward with the same pressure!Slide20
Barometer
= any instrument that measures air pressure
.
“bar” refers to “air pressure”
The flexible chamber on the barometer contracts when the air pressure increases and expands when air pressure decreases.Slide21
Isobars
=
a line on a map connecting points having the same atmospheric
pressure.