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It is the inside of a centrifuge where the rotor gets attached (the top spins, and the two pins ensure proper seat of the rotor on the conical piece). Here is a better picture of the inside of a Sorvall RC-5C Plus Floor Centrifuge, with the hands serving as scale bar. This is partially disassembled to show how one would change the motor brushing.
Screenshot ...
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How should you report measurements and uncertainty for a measuring cylinder with 0.5 mL graduations?
common convention is to report the uncertainty of an analogue
instrument as plus or minus half of the smallest scale division
Yes, this is merely a poor convention propagated by general chemistry texts.
Actually, this does not reflect analytical measurement standard deviation, and this is not the way volume uncertainty should be expressed. The correct ...
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