Which statement about compressed gases is correct?

• A. It is stored under pressure.
• B. It is stored under temperature fluctuations.
• C. It is a gas at room temperature.
• D. It evaporates instantly.

Answer: (C)

Compressed gases are defined by being kept at a pressure above atmospheric. In everyday use, the substance inside a cylinder remains in the gaseous form at room temperature, which is why describing it as a gas at room temperature accurately reflects how these cylinders are encountered and used. The pressure is what keeps the gas contained, but the phase—gas—at ambient temperature is the practical characteristic you deal with. The idea of temperature fluctuations isn’t the defining feature for this category, and claiming it evaporates instantly isn’t correct for typical handling.