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Q.
If the size of bacteria is $1$ micron, what will be the number of it in $1 \,m$ length ?
Physical World, Units and Measurements
Solution:
$1$ micron $= 10^{-6}\,m$
$\because 10^{-6}\,m$ space is occupied by $1$ bacteria.
$\therefore 1\,m$ space will be occupied by
$10^6$ bacteria $= 1$ million bacteria