The issue of the relative density of oxygen

Yes, your understanding is correct. Relative density refers to the ratio of the density of a substance to the density of another reference substance. Normally, the relative density of a gas is compared to the density of air. The relative density of air is defined as 1. So when you see that the relative density of oxygen is 1.105, it means that the density of oxygen is higher than that of air under standard conditions. Under standard conditions, the main components of air are nitrogen (about 78%) and oxygen (about 21%). The relative density of nitrogen is approximately 0.967, meaning it is slightly lighter than air ； The relative density of oxygen is about 1.105, making it slightly heavier than air. Therefore, pure oxygen is indeed heavier than air. When pure oxygen is released from a container, it tends to diffuse downward because it is heavier than air. However, due to collisions between gas molecules and air flow, oxygen eventually disperses in space and mixes with the air. In a still environment, oxygen may accumulate near the point of release for some time, but in the presence of wind or air flow, it mixes quickly with the surrounding air. Please note that this property of oxygen requires special attention when using it safely, as it can accumulate in low-lying areas, creating an oxygen-rich environment that increases the risk of fires and explosions. .

The density of oxygen is 1.4239； The air density is 1.29, and the relative density is 1.103; the difference is not significant. Oxygen is highly reactive and generally difficult to accumulate in open areas, but it can gather in low-lying areas and confined spaces.

“Does oxygen diffuse to lower areas when it comes out of the container? ”It’s not understood in that way; once oxygen is released, it spreads in all directions. If there is wind, it will spread further in the direction of the wind. The lower area is slightly higher than the higher area, but the difference isn’t very large

This post was last edited by wanlirn on 2023-12-13 08:05. Gases with a density greater than that of air will accumulate in lower areas if they leak; especially in enclosed spaces, it is necessary to take appropriate safety measures during maintenance work. Isn’t this common sense in the safety management of chemical plants? Don’t mislead others, or your performance rating will be affected

Only capable of qualitative analysis, not quantitative analysis; just parroting what’s in the textbooks superficially, with no sign of any practical experience

This theory doesn’t work in practice; it lacks logic and is not clear at all. It’s pointless to waste time talking to him about it. The poster’s question is also a kind of silly question. Oxygen is heavier than air; this is a generally correct statement. The other elements in the question are variables, in the absence of any specific constraints or regulations. Furthermore, the diffusion of any gas in air is essentially a random free diffusion, unless there are significant differences in factors such as temperature, density, and flow velocity.

Can’t it be explained by the gas state equation? Under standard conditions, the volume of any substance is 22.4 L/mol; this value can be calculated regardless of the conditions