1atm \( = \)

\( 100 \mathrm{cm} \) of \( \mathrm{Hg} \)
\( 76 \mathrm{cm} \) of \( \mathrm{Hg} \)
\( 20 \mathrm{cm} \) of \( \mathrm{Hg} \)
\( 25 \mathrm{cm} \) of \( \mathrm{Hg} \)

Correct answer: \( 76 \mathrm{cm} \) of \( \mathrm{Hg} \)

Solution

One atmosphere is defined as the pressure exerted by a mercury column of about 76 cm at standard conditions. So the correct equivalence is 76 cm of Hg.

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