air’s density changes two ways heat what happens to the air pressure on my head as the temperature...
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Air Pressure• The weight of air.
• Measured with a barometer in millibars or inches of mercury.
• Decreases with altitude (less air).
• CAN CHANGE IF DENSITY CHANGES!
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Air’s density changes two ways
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heat
HOT IS LESS DENSE
REMEMBER…
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COOL atmosphereWARMER atmosphere
What happens to the air
pressure on my head as
the temperature increases?
HOT atmosphere
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1. Heat makes molecules expand. Hot air is less dense.
Heat = Air Pressure
Which coffee can
barometer is in the cold
air?
21o C - 4o C
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Air pressure is usually lower when air
(1) gets colder(2) gets warmer(3) increases in density(4) weighs more
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REMEMBER…different molecules have different densities.
2.7 g/cm3 8.9 g/cm3
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Different air molecules ALSO have different densities.
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Atomic Mass tells usHow dense the atom is.
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14 amu + 14 amu =28 amu
16 amu + 16 amu =32 amu
1 amu + 1 amu + 16 amu =
18 amu
Water vapor is less dense than Oxygen
or Nitrogen.
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2. Water vapor (H2O) decreases the atmosphere’s density.
Moisture = Air Pressure
Dry Air (mostly N2 &
O2)
Moist Air (more H2O less N2 or
O2)
Which
weighs
more?
Which is less dense?
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• Air pressure increases as air becomes colder and drier.
• Air pressure decreases as air becomes warmer and moister.
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Air pressure is usually lowest when the air is
(1) warm and dry(2) warm and humid(3) cool and dry(4) cool and humid
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Air pressure is usually highest when the air is
(1) cool and humid(2) cool and dry(3) warm and humid(4) warm and dry