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A degree of freedom is the number of variables that must be fixed to

  • A.define the system's condition completely
  • B.bring the system to equilibrium
  • C.increase the number of phases by one
  • D.convert one component into another

Answer: A

Correct answer: define the system's condition completely

The degrees of freedom count the intensive variables - temperature, pressure, composition - that may be varied independently without changing the number of phases, and equivalently the number that must be fixed before the state is determined. It says nothing about how equilibrium is reached, only about the equilibrium state.

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