I think you have something interesting here. The experiment is well described and the examples that you use have real world application that people would understand and appreciate. To me, it reads like a short script for a YouTube clip, if that makes sense.

I have no comments about the science (because I know nothing about the magnetic qualities of Oxygen) but I do have some writerly advice for this.

First: I think you may do well to consider this a short essay. Essays (like paragraphs) have a structure that basically goes: 1. Describe what it is you plan to do. 2. Do it. 3. Explain what it was you just did and give any further implications.

Here, I think you're missing the first bit--something to give your reader context as to what you're planning to do with this piece of writing. Consider adding onto the beginning of your piece a short paragraph that describes why this is important to you--why the question came up. You want to guide your readers into this information instead of simply plopping them into the experiment. Why should we care about whether oxygen or magnetic--why did this come up?

Second: Consider giving a link to the wikipedia article in your essay. You are presenting this as a secondary source--make it easy for your reader to access that source.

Third: Edit your item and genres so that it will be part of the listings. Right now, it can only be found under "other" but this is about science or chemistry or technology or medicine or cars . . . if you add a genre, someone who may have similar interests may find it and give some feedback that is about the content not just the structure like I'm doing.

Fourth: Read your item aloud. This is something I recommend to everyone. Read every sentence. Does it sound right? If there is a place where you stumble, your readers will, too. Is it a sentence? Every sentence should be a complete thought where the subject and the verb are close to each other so that they communicate well with the reader. Read every word. Is it the right word? Is there a word that has more connotative value that would work better?

You have the bones of a good essay.
Thanks for writing.