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State whether the following is true or false.
Fugacity has the units of pressure.

  • A.False only at small scales
  • B.True
  • C.False
  • D.True only at large scales

Answer: B

Correct answer: True

Fugacity was introduced as a corrected pressure - the quantity that plays the role pressure would play if the substance behaved ideally - so it carries the units of pressure and is usually quoted in bar or in pascals. It is the *coefficients*, fugacity and activity alike, that are dimensionless, being ratios of fugacities.

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