The submarine's air locks hissed as the crew moved between compartments.

In the remote outback, schools of the air provide vital lessons to children who live hundreds of miles from the nearest town.

Scientists compared air pressures recorded at different altitudes to study weather patterns.

The air-ducts in the old theater were clogged with dust and needed immediate cleaning.

The washing machine stopped because an air lock in the drainage pipe prevented the water from flowing out.

She placed an air refresher near the entrance to welcome guests with a pleasant scent.

I placed several air refreshers around the office to keep it smelling pleasant.

Many restaurants have installed air cleaners near the entrances to improve indoor air quality.

The campers were skeptical about the new air stoves, but they proved efficient on windy nights.

The old air stove in the farmhouse efficiently warmed every room through a network of ducts.