Hmm, it's not a yoctometer, it's actually a planck length, that's apparently the size of quantam foam. However, calling the planck length a 'measurement' is a little misleading since we have no means whatever of actually measuring things that small and we may never have. It is useful currently only in theoretical work. See the discussion and modify your question if necessary.
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The smallest measurement typically used in everyday situations is the millimeter, which is one-thousandth of a meter. In scientific contexts, measurements can be even smaller, down to the scale of nanometers (one-billionth of a meter) or picometers (one-trillionth of a meter).
No, a byte is the smallest unit of measurement in computing. A megabyte is equal to 1,000,000 bytes.
Yes, the smallest unit of measurement, such as a nanometer, is smaller than the thickness of a strand of hair. A strand of human hair is typically around 80,000-100,000 nanometers in diameter.
25mm
A centimeter is equivalent to 10 millimeters on a standard ruler. It is the second smallest unit of measurement on most rulers, with millimeters being the smallest.
The smallest unit of measurement on most tape measures and rulers is typically 1/16 inch or 1 millimeter. Some high-precision instruments may have markings for 1/32 inch or even smaller increments.