Which color corresponds to Nitrogen?

Which color corresponds to Nitrogen?

• A. Black
• B. Brown
• C. Blue
• D. Gray

Answer: (A)

Color coding of compressed gas cylinders is a safety shorthand used in anesthesia practice to identify the gas at a glance. In the standard system many settings use, nitrogen is black. This helps distinguish it from other common gases—blue for nitrous oxide and gray for carbon dioxide—reducing the chance of dangerous mix-ups in a busy environment. The brown color isn’t part of the standard set for these gases. Always verify with the cylinder label and markings, since color schemes can vary by country or institution.

Color coding of compressed gas cylinders is a safety shorthand used in anesthesia practice to identify the gas at a glance. In the standard system many settings use, nitrogen is black. This helps distinguish it from other common gases—blue for nitrous oxide and gray for carbon dioxide—reducing the chance of dangerous mix-ups in a busy environment. The brown color isn’t part of the standard set for these gases. Always verify with the cylinder label and markings, since color schemes can vary by country or institution.