When motor oil sits in a pan, it appears to persist, but this is largely due to the oxidation and polymerization occurring within the liquid. Evaporation occurs when molecules at the surface of a liquid gain enough kinetic energy to break free from the liquid's intermolecular bonds and enter the atmosphere as vapor.
Cooking Oil Vs Motor Oil Evaporation: Understanding True Evaporation vs. Degradation
Heavy residues: These molecules are too large to escape easily and remain liquid. Medium fractions: These contribute to odors and moderate evaporation rates.
Conversely, in a kitchen setting, the "evaporation" noticed in a pan is often the oil reaching its smoke point and breaking down chemically, rather than the liquid turning into gas and disappearing. The Difference Between Evaporation and Degradation While the light fractions of oil do evaporate, the bulk of what we observe as "used oil" does not disappear in the same way a puddle of water does.
Cooking Oil Vs Motor Oil Evaporation: Understanding True Evaporation vs. Degradation
Understanding this distinction clarifies why a bottle of old motor oil left open loses little mass over time, while a volatile solvent disappears overnight. The short answer requires a distinction between true evaporation and the broader category of liquid degradation, as the volatility of different hydrocarbon chains dictates the fate of the substance.
More About Does oil evaporate
Looking at Does oil evaporate from another angle can help expand the discussion and give readers a second clear paragraph under the same section.
More perspective on Does oil evaporate can make the topic easier to follow by connecting earlier points with a few simple takeaways.
