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What means the gases around the Earth?
atmosphere
What word means what is happening in a specific place and time in the atmosphere?
weather
What element makes up 21% of the air around us?
Oxygen
What element makes up 78% of the air around us?
Nitrogen
What do we call gases in the air like Argon, Carbon Dioxide and Neon?
Trace Gases
What is an example of Oxygen being used up quickly?
Flames
What is a slow effect oxygen has?
Rust
This is made of 3 oxygen atoms.
Ozone
This is not the same thing as steam. What is water in gas form called?
Water Vapor
What do dense air molecules do?
The stay close together.
What happens to air molecules at high elevations/altitudes?
The spread out.
Is there more air pressure at sea level or on top of a mountain?
At sea level
What instrument measures air pressure?
Barometer
What does a mercury barometer have that an aneroid barometer does not?
Liquid mercury
Why is it difficult to breathe at the top of a mountain?
The oxygen air molecules are more spread out so you need to take more breathes.
What are 2 measurements for air pressure?
Millibars and inches of mercury
