In most other places, air tends to be invisible.

The hot air over the land tends to rise, creating an area of low pressure.

The 'bad' air tended to lead to premature death, rather than explosions.

Drink lots of water, because the air in jets tends to be dry.

However, bright light, heat, and open air all tend to reduce the intensity of its color over time.

Because it requires less bend force, air bending tends to use smaller tools than other methods.

The reason may be found in the fact that the air tends to burst upwards through the water along the path of least resistance.

When you crank up the heat during cold weather, the air in your home tends to become very dry.

"The air tends to be rarefied at private schools," he said.

This time of year, in a windowless room, the air tends to be close.