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Which of these methods is not used in describing the composition of air which is at a chemical equilibrium?

(a) Partial pressure

(b) Partial temperature

(c) Mass fraction

(d) Mole – mass ratio

This question was posed to me during an online exam.

The question is from High Temperature Gases topic in chapter Properties of High Temperature Gases of Aerodynamics

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Right choice is (b) Partial temperature

For explanation I would say: There are several ways to describe the composition of air which is at a chemical equilibrium. These are – partial fraction, concentration, mole fraction, mole – mass fraction and mass fraction. These help in determining the composition of the reacting gas.

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