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## Q. 5.1

The pressure outside a jet plane flying at high altitude falls considerably below standard atmospheric pressure. Therefore, the air inside the cabin must be pressurized to protect the passengers. What is the pressure in atmospheres in the cabin if the barometer reading is 688 mmHg?

Strategy Because 1 atm = 760 mmHg, the following conversion factor is needed to obtain the pressure in atmospheres:

$\frac{1 atm}{760 mmHg}$

## Verified Solution

The pressure in the cabin is given by

pressure $=688 \cancel{mm Hg} \times \frac{1 atm}{760 mmHg}$

=0.905  atm