What is the white stuff that comes out of an airplane while in the air?

Answer 1

Contrails are created in one of two ways:

1. First, the airplane's exhaust increases the amount of moisture in the air, which can push the water content of the air past saturation point. This causes condensation to occur, and the contrail to form.

Aviation fuel such as petrol/gasoline (piston engines) or paraffin/kerosene (jet engines) consists primarily of hydrocarbons. When the fuel is burned, the carbon combines with oxygen to form carbon dioxide; the hydrogen also combines with oxygen to form water, which emerges as steam in the exhaust. For every gallon of fuel burned, approximately one gallon of water is produced, in addition to the water already present as humidity in the air used to burn the fuel. At high altitudes this steam emerges into a cold environment, (as altitude increases, the atmospheric temperature drops) which lowers the temperature of the steam until it condenses into tiny water droplets and/or desublimates into ice. These millions of tiny water droplets and/or ice crystals form the contrails. The temperature drop (and therefore, time and distance) the steam needs to condense accounts for the contrail forming some way behind the aircraft's engines. The majority of the cloud content comes from water trapped in the surrounding air. At high altitudes, supercooled water vapour requires a trigger to encourage desublimation. The exhaust particles in the aircraft's exhaust act as this trigger, causing the trapped vapor to rapidly turn to ice crystals. Contrails will only occur when the outide air temperature around the aircraft is at or below -57 degrees centigrade.

2. The wings of an airplane cause a drop in air pressure in the vicinity of the wing (this is partly what allows a plane to fly). This drop in air pressure brings with it a drop in temperature, which can cause water to condense out of the air and form a contrail but only at higher altitudes. At lower altitudes, this phenomenon is also known as Ectoplasm. Ectoplasm is more commonly seen during high energy manouvers like those of a fighter jet, or on jet liners during takeoff and landing, at areas of very low pressure, including over the wings, and often around turbo-fan intakes on takeoff. See also Wing tip vorticies.

Exhaust contrails tend to be more stable and long-lasting than wing-tip contrails, which are often disrupted by the aircraft's wake and are commonly very short-lived.

Answer 2

It doesn't come out of the airplane, - it is already in the air! The increased pressures in the air caused by airplane passing through it (fast) causes the water molecules to unite and cause contrail (fog - or cloud appearance).

If you watch a propeller powered airplane "running up" the engine on ground, - you will see water flying out form tips of the blades, (if humidity is above 40%) even on sunny days. This is most obvious in mornings (more moisture in air). The tips pof the propeller blades are going near supersonic - at max rpms!

Answer 3

The condensation trail (contrail or vapor trail) is formed when at high altitude the warm moist exhaust from a jet engine cools and water droplets condense... a cloud forms. These usually form when the plane is upwards of 10,000 ft. You can often see a gap between the engine exhaust and the contrail which is the distance the plane travels before the exhaust has cooled enough to begin condensing.

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Answer 4

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Answer 5

Steam. Under certain atmospheric conditions, moisture forms these cloud like trails after a jet on the sky, it does not happen always.

Answer 6

the white trail coming from behind an airplane's engine(s) are called vapor trails, they appear when the plane is flying at a high altitude i have heard of them being refered to as "high altitude trails"

Answer 7

Are you talking about the exhaust that forms the contrail or the whitish blue ice that comes out of the potty and falls as ice?

Answer 8

its called a contrail.
it is formed by moist air being compressed, water droplets form making a cloud,

Answer 9

Chemtrails. The government is spraying us with mind control agents. Why do we Americana's want to think everything is a conspiracy?

http://www.chemtrails.com

Answer 10

it is condensation basicly water from the intence heat of the airplane.