air pressure aim: what is air pressure?. do now: what happened to this cup?
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Air PressureAir PressureAim: What is air pressure?Aim: What is air pressure?
Do Now:Do Now:• What happened to this cup?
1. What is air pressure?1. What is air pressure?• Air pressure is the force of air
pushing down on us.
• Air is pulled down to earth by gravity.
• http://kids.earth.nasa.gov/archive/air_pressure/
1. Hot air balloons1. Hot air balloons• Observe how air pressure affects a ri
sing weather balloon.• http://kids.earth.nasa.gov/archive/air
_pressure/balloon.html
• As the balloon rises higher, the air pressure decreases on outside, allowing the balloon to expand and rise.
Air Pressure DemosAir Pressure Demos• http://www.youtube.com/watch?
v=JPbT6Z97b20• http://www.youtube.com/watch?
v=OHY9fFQhX68&feature=related• http://www.youtube.com/watch?
v=RPlCO3AITV4&feature=related• http://www.youtube.com/watch?
v=ctJyu5ete6Y• http://www.youtube.com/watch?
v=mT6YEXhqIAk&feature=related
2. How is air 2. How is air pressure measured?pressure measured?
• A barometer is used to measure air pressure.
• Mercury barometer -The air pushes down on the mercury and forces mercury up the glass tube.
Aneroid barometer – metal chamber (aneroid) connected to a dial. Aneroid = “without liquid” Pressure expands and contracts the metal
• http://www.upscale.utoronto.ca/GeneralInterest/Harrison/Barometer/Barometer.html
3. Air pressure and 3. Air pressure and Temperature changes at Temperature changes at
different altitudesdifferent altitudes
• mountain vs. beach
4. Mountain vs. Beach4. Mountain vs. Beach• At high altitude (mountain), the air
pressure decreases and the temperature decreases (gets colder).
• At low altitude (beach), the air pressure increases and the temperature increases (gets warmer)
5. Sea level air 5. Sea level air pressurepressure
• 29.92 inches of mercury
• 1013.2 mb• 1 atmosphere• Any number above
is considered High pressure, below is Low pressure
6. How does a barometer 6. How does a barometer help forecast the weather?help forecast the weather?
• Rising barometer = higher air pressure = weather will improve (good weather)
• Falling barometer = lower air pressure = worse weather
• http://kids.earth.nasa.gov/archive/air_pressure/barometer.html
• Examine how barometric pressure changes with weather conditions.
7. Weather vs. Climate:7. Weather vs. Climate:• Weather is the mix of events that
happens each day in our atmosphere.
• Climate is the average weather in a place over many years.
• Example: the climate of a desert is hot and dry…but there are days that it can rain.
8. Summary:8. Summary:• Air pressure changes…it is not the
same everywhere.• Air pressure contributes to the
weather conditions.• How does air pressure affect your
life? – Affects the weather– Need a certain air pressure to breath– Allows us to forecast the weather
Alvin Rover ….Atlantis Alvin Rover ….Atlantis expedition 2006.expedition 2006.
• The Styrofoam cup was aboard a deep ocean roving vessel.
• The pressure was SO HIGH under the ocean that all the air was squeezed from the Styrofoam and shrank the cup.
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