Download - Solar Energy Heat and Light. Energy Can take many different forms –____________ –Heat –____________
Solar Energy• Electromagnetic waves
–Can travel through _________
–This is called ______________
• Includes all the different _________________
Solar Energy
• The energy that reaches Earth is mostly–______________ (IR) radiation
• heat
–Visible _____________• The rainbow
–Ultraviolet (UV) ____________• damaging
Solar Energy in the Atmosphere
• When this energy hits the atmosphere it can be–_______________
–__________ back into space
–________________
Solar Energy in the Atmosphere
• Water vapor and ___ absorb IR
• Ozone absorbs ______
• Clouds, dust, and other gases also ________ energy
Solar Energy in the Atmosphere
• Clouds ______ some energy back into space – like mirrors
• Dust particles and gas molecules _____ the rays in all directions–This is what you see when
you look at the __________
Why is the sky blue?
• ___________ wavelengths are ____________ more than red
• What about sunrises and sunsets?–The light is passing through
thicker atmosphere which filters more blue out see more reds
Solar Energy at Earth’s Surface
• The energy that makes it through the atmosphere reaches the ______ of the earth
• Can be–______________
–Absorbed
–Re-radiated as __________
Solar Energy at Earth’s Surface
• Some energy is bounced back (reflected) into _________________
• Some is __________ by land and water heat
Solar Energy at Earth’s Surface
• ______ gives off (radiates) heat
• This is in the form of ______ radiation
• IR radiation __________ travel through atmosphere very well
Greenhouse effect
• __________ by water vapor, CO2, methane and other gases–_______________ gases
–Hold _____ in the atmosphere greenhouse effect
Greenhouse Effect• Greenhouse effect needed
for _______ to exist on earth• BUT if we increase the
amount of greenhouse gases in the atmosphere then ___ ________ heat is trapped global warming
Energy and Heat• ____ are made of molecules• The more energy molecules
have the _______ they move• ___________ is the average
amount of energy of motion each molecule of a substance has
Energy and Heat• Substances with ____ moving
molecules feel ___________
• Substances with ___________ moving molecules feel ______
Heat Transfer• Energy is _____________ from
hotter to colder objects as heat
• Heat _____ from place to place in three ways–_____________
–Conduction
–_____________
Radiation• _________ traveling through
space as electromagnetic waves
• Feel heat coming from a ___________–Sun–Fire–______________
Conduction• Direct transfer of heat through
___________ with the source
• Fast moving “hot” molecule _____ into slow moving “cold” molecule and makes it move faster
Convection• Transfer of heat when hot
molecules ____ to a new area
• Liquids and gases are considered ______________ –Molecules move from place to
place = _______________
How to heat your hands
• If you put your hands near it = ____________
• If you put your hands on it = ____________
• If you put your hands over it = ___________
Heat Transfer in the Troposphere
• Heat from _______ radiation heats air and earth’s ______
• Earth’s surface heats lower troposphere by __________
• Hot air _____ warming upper troposphere by convection
Heat and Weather• The movement of _____ in the
atmosphere causes–Temps to change
–__________ to blow
–Rain to fall
Measuring temperature• One of the most important
elements of _____________• Use a _________________• The energy of the air is transferred
to the liquid in the bulb• The more ____________ the liquid
molecules the more space they need– Level rises