How can I measure oxygen content in the air?

Did you wake up this morning? Then, there’s plenty of oxygen in your room. lol

Okay…seriously…I don’t know, but look….science Cy charges in…—waiting, waiting to learn something new.

Search for “oxygen monitors” on any industrial suppliers’ websites (such as Grainger, for one example) and you’ll find all kinds of portable (wearable) battery-powered oxygen monitors as well as plug-in models that you can leave in one place.

This is a very common piece of industrial safety gear. Easy to find.

@Coloma This is more out of curiousity than anything else, but yah, I think I woke up this morning. Although, no caffeine yet so it’s a matter of definition.

@CWOTUS Good info, I’ll go hunting, thanks!

Put some steal wool in the bottom of a test tube. Invert the test tube and place in some shallow water so the air is trapped. The steal wool will rust. This is oxidation so it will take O2 out of the air. This will reduce the pressure of the in he tube drawing water up the test tube. The more O2 in the air to start with the further up the tube the water will rise.

Mind you it’s not the fastest chemical process in the world.

I know this isn’t exactly what you asked for, but I find the CMS60D to be indispensable for some night-time activities which I enjoy (and some day-time activities, too) :-p

@Lightlyseared the simplicity of that is intriguing and elegant !

@HungryGuy While snooping around per @CWOTUS‘s suggestion I ran across some of those too. I am thinking about measuring the air mix more than blood oxygen but that gadget can tell a lot of interesting things too, thanks.

Get an O2 meter or a more comprehensive indoor air quality meter which can tell you concentration of other gases like CO, CO2 etc. I think @Lightlyseared‘s idea sounds really neat but if you want to measure the change in amount of these gases over the period of say a night, you’ll need a meter.