Fog Spreads Through Plane Cabin With Passengers On Board Like In A Horror Flick

During a short flight to Charleston International Airport in South Carolina, USA, these passengers had to wait for the plane to cool down while boarded on the tarmac because of air conditioning difficulties. Take a look at what happens when the air conditioning is shut off!Show more

If you were sitting on this airplane waiting to take off, would you be as chill as the two ladies who shot this clip? We think not, although there is a pretty logical, scientific explanation to this phenomenon, and it is related to the plane’s AC.

The way aircraft AC works is basically air bled from the engines about halfway of its compressor stage and is about 400F degrees. Obviously this needs to be brought down. This happens in an AC unit that uses the outside air that is pretty cold. On the ground and low altitudes a fan is also driven by the hot air for extra cooling.

By doing this, extra thermal energy is taken from the engine bleed air. After the cooling process, the air should be around 45 F, which is great for cooling, but needs to be heated during flight.

There are several methods to do this, the most common is taking the air after the first cooling radiator, which now is pretty hot, and use a second point to slightly heat the air going into the cabin.

Air from the atmosphere and the one in the cabin do not mix physically - all cooling and heating is done by radiators, and regulated automatically by the airco pack. The flight crew can only tell how hot or cold they want it to be.

Now for the super weird part - every aircraft has a water separating unit in their AC, which might have been misbehaving during this flight, thus explaining the “fog”.