Acetic acid (CH3COOH) is mainly used in the chemical industry for the production of VAM (vinyl acetate monomer) and PET (polyethylene terephthalate) but is also used as a preservative and as a food additive (E260).
Its quality as well as its content in an aqueous solution can be determined using refractometry.
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Radio wave weapon knocks out drone swarms
I hope they have assessed how easy it is to shield a drone against the attack. Hopefully the shielding would add too much weight.