What is the SG value listed for Oxygen (02)?

What is the SG value listed for Oxygen (02)?

• A. 0.97
• B. 0.55
• C. 1.11
• D. 0.07

Answer: (C)

Specific gravity for gases is a comparison of a gas’s density to the density of air at the same conditions. If the SG is greater than 1, the gas is heavier than air; if it’s less than 1, the gas is lighter. Oxygen gas is denser than air, so its SG is above 1. Using standard conditions, oxygen has a density around 1.43 g/L while air is about 1.29 g/L, giving a ratio near 1.11. That’s why the SG value listed for oxygen is 1.11. The other numbers describe gases that are lighter than air (for example, around 0.07 for hydrogen) or only slightly denser than air (like 0.97), which wouldn’t fit oxygen.

Specific gravity for gases is a comparison of a gas’s density to the density of air at the same conditions. If the SG is greater than 1, the gas is heavier than air; if it’s less than 1, the gas is lighter.

Oxygen gas is denser than air, so its SG is above 1. Using standard conditions, oxygen has a density around 1.43 g/L while air is about 1.29 g/L, giving a ratio near 1.11. That’s why the SG value listed for oxygen is 1.11.

The other numbers describe gases that are lighter than air (for example, around 0.07 for hydrogen) or only slightly denser than air (like 0.97), which wouldn’t fit oxygen.