A McLeod gauge having volume of bulbs and mercury capillary, $V = 100 \times 10^{-6}\text{ m}^3$ and the diameter of measuring capillary is $1\text{ mm}$. For the reading of $60\text{ mm}$, the pressure will be}
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Always double check units in McLeod gauge formulas.
Keep all quantities in standard SI units (meters, cubic meters) before converting to standard vacuum units like $\mu\text{m}$ of Hg (which is equivalent to milli-Torr).