Atmospheric Sciences
A few examples of what you can ask Wolfram|Alpha about:
Standard Atmosphere
compute atmospheric properties for a given elevation
Atmospheric Layers
learn about the layers of the atmosphere
specify a layer by name
specify an altitude above the Earth
Atmospheric Composition
get data on the composition of the atmosphere
Barometric Pressure
estimate barometric pressure
specify a location
get information about a type of cloud
compute cloud base height
investigate raindrops
compute properties of raindrops
determine raindrop size from the rate of rainfall
compute the carbon dioxide cost of heating a house
find carbon dioxide equivalents of chemicals
Electromagnetic Radiation
compute the attenuation coefficient for radio waves in air