15.2 Atmospheric Heating You are lying in a park with your eyes closed, and you feel the warmth of...
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Transcript of 15.2 Atmospheric Heating You are lying in a park with your eyes closed, and you feel the warmth of...
15.2 Atmospheric Heating
You are lying in a park with your eyes closed, and you feel the warmth of the sun on your face.
Did you ever realize that it takes a little more than 8 minutes for the energy to travel to your face from a star 149,000,000 km away?
Radiation
Sun on your face
standing by campfire
direct transfer of energy by electromagnetic waves through space.
Conduction
Bare feet burned by hot sand
direct transfer of heat from one substance to another through direct contact.
Convection
Basement colder than upstairstransfer of heat by the movement of fluid or air. Hot air rises, cold air sinks.Transfer of energy by circulation.
Examples
Cooking on the stove-pot on burner
Hot air balloon rising
Fireplace warming a room
Curling iron on hair
Blow dryer on hair
Air from furnace heating the house
How is Earth heated?
Light/heat from the sun RADIATES through the atmosphere, hits the Earth where it is absorbed.This heats the air above it by CONDUCTION.This heat rises up to the greenhouse gases where it is trapped, cools, sinks and heats at the surface again.-CONVECTION.
Radiation
Ever feel the heat of the sun on your face or the heat from standing by a campfire? That is radiation.
It is the direct transfer of energy by electromagnetic waves.
Conduction
Have you walked barefoot on the sand at the beach and the sand burned your feet? That is conduction.
It is the direct transfer of heat from one substance to another.
Convection
Have you ever come inside with wet shoes on and your mother told you to put them over the heating vent to dry? How does this dry them even though the actual furnace is in the attic? That is convection.The transfer of heat by the movement of fluid or air. Hot air rises, cold air sinks.
Bonfire Example
Radiation keeps you away.
Smoke and flame are carried away by convection.
Ground beneath the fire gets hot by conduction.
How earth is heated.
Light/heat from the sun radiates through the atmosphere, hits the Earth where it is absorbed.This heats the land and air above it by conduction.This heat rises up to the greenhouse gases where it is trapped, it cools, sinks and heats at the surface again.-Convection.Think about it: Why does 70 degrees in Spring feel colder than 70 degrees in Fall?
Energy from the sun is the driving force behind the water cycle, which contributes to create Earth’s weather.
Radiation is transfer by electromagnetic waves. Thermal conduction is energy transfer by direct contact. Convection is energy transfer by circulation.
The greenhouse effect is Earth’s natural heating process. Increasing levels of greenhouse gases could cause global warming.
Greenhouse Effect
These gases absorb the heat and act as a “blanket” to keep Earth warm.
Some greenhouse gases: water, methane, carbon dioxide.
The Greenhouse Effect
Global Warming
gases (CO2 and water vapor) absorb thermal energy and radiate it back to Earth a process that reminds us of an actual greenhouse
an increase in average global temperatures
an increase in greenhouse gases in the atmosphere
VS.
Global Warming Causes
Natural:Volcanoes
Solar flares
Flatulence
Cycle
Orbit
Snow
Poop
Cows
Forest fires
Methane release in the arctic tundra
Manmade Causes:Industry
Deforestation
Cars
Fossil fuels
Hairspray
Wars
Blow dryers
Heat/AC
Hot water
Arms race
Nuclear waste
Coal burning
Electricity
Land fills
Acid rain
Egg in bottle
Fire warmed up air inside, molecules escaped before egg was put on top and when egg wobbled.
When fire went out, temperature cooled, molecules condensed, changing air pressure.
Since the pressure outside bottle was higher, the higher pressure tried to get in the bottle.
Since the egg is squeezable, it got pushed into the bottle by the air.