Respiratory Tract

Clean air should not smell bad. - 13

At higher altitudes the atmosphere gets thinner and the air pressure is reduced. - 30

We have the right to breathe clean air. - 32849

Aircraft can ignore gravity by increasing thrust and lift. - 282

Underwater air bubbles ignore gravity and float to the surface of the water. This is due to density and buoyancy of the bubble compared to the surrounding water. Gravity cannot keep the air bubble down under the water. - 283

Blow your nose to remove mucus and dust particles. - 438

The airline passengers are required to shut off electronic devices during takeoff and landing. - 626