Definition
Acetylene gas stored safely under pressure by dissolving it in liquid acetone, which is held within a porous filler material inside the cylinder. Free acetylene becomes unstable and can decompose explosively above roughly 15 psi, so it is dissolved in acetone to allow safe storage at higher pressures for use in welding, brazing, and cutting operations during aircraft maintenance and fabrication.
Plain English
Acetylene is a gas used for welding, but on its own it becomes dangerous when squeezed into a tank. To make it safe to store, it is mixed into a liquid (acetone) that soaks into a sponge-like material inside the cylinder. The gas stays calm there until it is needed.
Context Anchor
Seen in aircraft maintenance discussions involving oxy-acetylene welding, cutting, and gas-cylinder handling.
Derivation
Acetylene comes from the Latin acetum, meaning vinegar, reflecting its early chemical relationship to acetic acid. Dissolved simply means held within a liquid. Together the term tells you the gas is not stored on its own but kept within a liquid carrier.
Why Pilots Care
Ensures safe handling of welding cylinders during aircraft structural repairs and prevents accidents from unstable gas storage.
Analogy
Think of soda water. The carbon dioxide is dissolved into the liquid and stays calm until the bottle is opened. Acetylene is held in acetone the same way, ready to come out as gas when the cylinder valve is opened.
Intuition Check
Do not assume this means ordinary compressed gas. The key idea is that the acetylene is dissolved in a liquid inside the cylinder to make storage safer.
Example Sentence 1
The maintenance shop kept its dissolved acetylene gas cylinders chained upright against the wall, away from heat sources.
Example Sentence 2
Cylinders of dissolved acetylene gas must be stored upright in the hangar to prevent acetone leakage.