What is true about acetylene tanks?

Acetylene tanks are designed to safely store acetylene gas, which is highly flammable. The correct choice states that they contain gas dissolved into liquid acetone. This is important because acetylene on its own is unstable and cannot be stored in high-pressure cylinders without being mixed with a solvent like acetone. The acetylene gas is dissolved in acetone under pressure, which allows for safer storage and handling. When the valve on the tank is opened, the acetylene gas is released from the liquid acetone, making it available for use in various applications, such as welding.

Understanding this mechanism is crucial for safety, as it prevents the dangerous conditions that might arise from transporting or using pure acetylene gas, which could lead to explosions or other hazards if not managed properly.