# What is the equivalent pressure of 0.905 atm in units of mmHg?

Jul 18, 2016

0.905 atm = 688 mmHg

#### Explanation:

Use dimensional analysis.

First determine the relationship between atmospheres and mmHg.

$\text{1 atm = 760 mmHg}$

There are two conversation factors:

$\left(1 \text{atm")/(760"mmHg}\right)$ and $\left(760 \text{mmHg")/(1"atm}\right)$

Multiply the given atm in your question by the conversion factor with 760 mmHg in the numerator.

$0.905 \cancel{\text{atm"xx(760"mmHg")/(1cancel"atm")="688 mmHg}}$