1
the condition of Earth’s atmosphere at a particular time and place
Weather
2
the envelope of gasses that surrounds the planet
Atmosphere
3
water in the form of a gas
Water vapor
4
the amount of mass in a given volume of air
Density
5
the result the of weight of a column of air pushing on an area
Air pressure
6
an instrument that is used to measure air pressure
Barometer
7
the distance above sea level
Altitude