Absorbed Gas is defined by having an internal receptacle pressure at 20°C of less than which value?

• A. 50 kPa
• B. 300 kPa
• C. 101.3 kPa
• D. 500 kPa

Answer: (C)

Absorbed gas is defined by having a low, ambient-like pressure in its container at 20°C, meaning the gas is held by an absorbent so its pressure stays below what’s in the surrounding air. The standard reference used in regulations is atmospheric pressure, 101.3 kPa. So if the internal pressure at 20°C is less than 101.3 kPa, the gas qualifies as absorbed rather than being a compressed or liquefied gas. That makes 101.3 kPa the threshold value. Pressures well above that (like 300 or 500 kPa) would indicate a compressed or liquefied gas, not absorbed. A value like 50 kPa is below the threshold, but regulations use 101.3 kPa as the defining cut-off.