Definition
The portion of a substance, such as a paint, dope, or solvent mixture, that evaporates into the air at normal temperatures and pressures, leaving behind only the solid or non-evaporating residue.
Plain English
The part of a liquid product that turns into vapor and disappears as it dries, leaving the solid material behind.
Context Anchor
Seen in aircraft maintenance, especially when working with paints, fabric-covering materials, primers, sealants, adhesives, and cleaning solvents.
Derivation
From the Latin volatilis, meaning 'flying' or 'fleeting.' The volatile content is the part that 'flies away' as vapor when the product is exposed to air.
Why Pilots Care
Volatile content affects fumes, fire risk, ventilation needs, drying time, and how much usable material remains after application.
Grounding Statement
When fresh aircraft paint gives off a strong smell as it dries, that smell is from volatile material leaving the coating and entering the air.
Intuition Check
Volatile does not mean emotionally unstable here. It means able to evaporate easily into the air.
Example Sentence 1
After the paint was sprayed onto the fuselage, the volatile content evaporated, leaving a smooth solid finish.
Example Sentence 2
Excessive volatile content in the avgas increased the risk of vapor lock on the hot summer flight.