True or False: Acetylene cylinders may be used in any position.

Acetylene cylinders are designed to be used in a vertical position to ensure the safety and effectiveness of the gas contained within. Unlike other fuel gases, acetylene is dissolved in acetone or a similar solvent inside the cylinder. When the cylinder is used upright, the gas can be released safely without risking an explosion or other hazards.

If acetylene cylinders are used in any position other than vertical, there is a risk that acetone could be released along with the gas, leading to dangerous conditions, such as flashbacks or even explosions. This storage and usage requirement is crucial to maintain the integrity of the gas and to prevent accidents in welding and cutting operations. Therefore, the statement is false because acetylene cylinders must be handled correctly by adhering to the vertical position guideline.