Even though we cannot see air, it is not just empty space. Air that surrounds us all the time is mainly a mixture of many gases. Air exerts pressure on us, but still does not crush us. In principle, we are living on the floor of a kilometre-thick ocean of air known as the air cover or the atmosphere of the Earth. Since, air is matter, it can also carry things: leaves in autumn, birds, aircrafts, hot-air balloons, and many more things. However, all objects need propulsion to lift from the more things. However, all objects need propulsion to lift from the ground-birds beat their wings, aircraft depends on propellers or jet engines.
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