On a cold day, a person takes in a breath of 450 mL of air at 86.6 kPa and -10 degrees C. what is the volume of this air in the lungs at 37 degrees C and 650 mm Hg?

To do this you need to understand the gas laws and how they work and relate to each other.

Read this page carefully
http://home.c2i.net/astandne/help_htm/english/gaseq1.htm

and you will be able to answer the question.

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