Composition of Air
21% of gases in dry air.
What is oxygen?
The amount of mass in a given volume of air.
What is density?
The distance above sea level.
What is altitude (or elevation)?
Where weather occurs.
What is the troposphere?
Harmful substances in the air, water, or soil.
What are pollutants?
78% of gases in dry air.
What is nitrogen?
PppThe force pushing on an area or surface.
What is pressure?
This decreases as altitude increases.
What is air pressure?
Where the ozone layer is located.
What is the stratosphere?
Rain that contains more acid than normal.
What is acid rain?
The condition of Earth’s atmosphere at a particular time and place.
What is weather?
The result of the weight of a column of air pushing down on an area.
What is air pressure?
As air pressure decreases, so does this.
What is density?
Protects the earth from meteoroids.
What is the mesosphere?
Some pollutants that effect human health.
What are:
carbon monoxide?
nitrogen dioxide?
ozone?
particles of dust, smoke, or soot?
sulfur dioxide?
Water in the form of gas.
What is water vapor?
An instrument that is used to measure air pressure.
What is a barometer?
This air has the weight of the whole atmosphere pressing on it, so the air pressure is greater here.
What is sea level?
Where aurora borealis occur.
What is the ionosphere?
Brown haze that develops in sunny cities.
What is photochemical smog?
The layer of gases that surrounds the planet.
What is the atmosphere?
Two common kinds of barometers.
What are mercury barometers and aneroid barometers?
The air is less dense at a high altitude, and there are fewer of these to breathe in each cubic meter of air than at sea level.
What are oxygen molecules?
Outer portion of the thermosphere.
What is the exosphere?
Something that prevents air pollution.
What is public transportation?