Very slightly lighter than air CO has a molecular weight of 28 g/mol and a density in air of 1.145 g/l.
The density of air is 1.2 g/l. (Air is mostly N2, which is also almost exactly 28g/mol.)
So the carbon monoxide is very slightly lighter than air. It does tend to rise, but mostly it mixes in with the air, and any currents in the air at all will bring some of it down to where the detector can detect it.
So they can build detectors that simply plug into the wall. There should be almost no carbon monoxide in the air most of the time, so they can set the sensitivity very low. The sensors will go off before there's enough CO in the air to hurt you.
One must remember..these home owned detectors have a life expectancy of 5 years max.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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