There can be big variations in the temperature based on height and distance from the ground.
It's a gas! Air consists of nitrogen and oxygen and lots of empty space.
Why does blowing on hot soup help to cool it off? The answer is evaporation.
Research suggests that early exposure to air pollution increases the risk of obesity.
Where's the best place to keep warm, a mountain top or a valley? Well, it just depends...
Don't worry, there's plenty of air to go around, even in tight spaces.
Human flight began as early as the 18th-century when scientists learned how to harness the power of different gases.
Despite weighing tons, clouds seem to free-float in the air. How do the billowy marvels stay up in the sky?
Most of us take our oxygen-rich atmosphere for granted. Once upon a time, though, Earth's air was very different.