Why are jet fuels considered more susceptible to water contamination than aviation gasoline?

Jet fuels are considered more susceptible to water contamination primarily due to their composition and physical properties. Jet fuel, specifically Jet A or Jet A-1, is a type of kerosene with a different specific gravity than aviation gasoline (AVGAS). It is designed to operate effectively in jet engines, but its chemical structure allows for a greater affinity for water compared to AVGAS.

One important factor is that jet fuel has lower surface tension, which makes it more likely to mix with water. When water comes into contact with jet fuel, it can disperse in the fuel in the form of microdroplets. Additionally, jet fuel systems typically operate in colder conditions, which can lead to condensation of moisture from the air, further increasing the risk of water finding its way into the fuel.

While viscosity and volatility are factors that contribute to fuel behavior, the susceptibility of jet fuel to water contamination specifically ties back to its lower density and its tendency to hold water, as well as the operational environment in which jet fuel systems are used. Thus, understanding the chemical properties and dynamics of fuel behavior under various conditions is essential for managing water contamination in jet fuel systems effectively.