A gas at 20 ° C may be considered rarefi ed, deviating fromthe continuum concept, when it contains less than 10 12molecules per cubic millimeter. If Avogadro’s number is6.023 E23 molecules per mole, what absolute pressure (inPa) for air does this represent?

A gas at 20 ° C may be considered rarefi ed, deviating fromthe continuum concept, when it contains less than 10 12molecules per cubic millimeter. If Avogadro’s number is6.023 E23 molecules per mole, what absolute pressure (inPa) for air does this represent?

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter5: Analysis Of Convection Heat Transfer

Section: Chapter Questions

Problem 5.5P: Evaluate the dimensionless groups hcD/k,UD/, and cp/k for water, n-butyl alcohol, mercury, hydrogen,...

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Question

A gas at 20 ° C may be considered rarefi ed, deviating from
the continuum concept, when it contains less than 10 ¹²
molecules per cubic millimeter. If Avogadro’s number is
6.023 E23 molecules per mole, what absolute pressure (in
Pa) for air does this represent?

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