1. Earth's atmopshere makes conditions
on Earth suitable for living things.
A. living things need air, warmth
and water
2. Atmosphere made of:
A. fig. 2, pg. 441 put in
order of decreasing %
3. Nitrogen (N2) is the most abundant
gas - 78%
3. What is the fire triangle?
A. represents the 3 components needed
for fire to burn
1. fuel
2. heat
3. air
B. What is in the air that burns?
1. Oxygen
(O2)
Summary
Left side
Discover pg. 440
Answer the "think it over"
1. Air has mass
A. other properties
1. pressure
2. density
D=M/V
D= density, M=mass, V=volume
2. Air pressure
A. fig. 9,pg. 452
1. air
is always around you - in all directions
3. How do you measure air pressure?
A. barometer
1. mercury
barometer
2. aneroid
barometer
4. Altitude
A. air pressure (decreases), altitude
(increases)
B. as air pressure decreases, density
decreases
C. read pg. 455 - Air at sea level...
Summary
Left side
fig.
Left side
wksht.