Acetone absorbs large amounts of acetylene, allowing storage of gas at a safe pressure.

• A. True
• B. False
• C. Only under high temperature
• D. Only with a regulator

Answer: (A)

Acetylene is stored in a dissolved form with acetone because pure acetylene becomes unstable at typical storage pressures. Acetone can absorb a large amount of acetylene, creating a stable solution that keeps the gas pressure in the cylinder at a relatively safe level. When gas is drawn off, more acetylene comes out of solution to replace it, while the acetone stays in the cylinder. This dissolution in acetone is what makes safe storage possible, not high temperature or a regulator. The regulator controls the pressure at the delivery end, not the storage safety itself.