1.   Blowing air creates a noisy hum.

2.   Each one is produced by blowing air into one or more of the caissons at different intervals.

3.   He was blowing air out of his spout.

4.   In fact, the person was blowing air into his mouth.

5.   It is a pump that keeps the airway open by blowing air through a tube into a mask worn over the nose at night.

6.   The more volatile pollutants will be extracted by blowing air into the soil.

7.   Volatile pollutants will be extracted by blowing air into the soil.