it would make sense that air weighs nothing... but apparently it does!
the molar mass of air, as we discovered this week, is about 30 grams per mole of air. so air has weight. whaaat.
we made a vacuum in a syringe (which was really hard to pull out D:) and then weighed it on a scale which kept going up and down :C. Then we put the air back in the syringe and weight it again. then we used lots of equations and stuff and calculated the number of moles of air in the syringe and how much it weighed. that's how we got the molar mass of air. yay! we kinda solved it like this but i think it was less complicated.
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