phase rule definition

  • noun:
    • Physics A rule stating the amount of examples of freedom in a material system at balance is equivalent to how many components without the number of phases plus the constant 2. For example, the system of water vapour, liquid water, and solid ice features zero examples of freedom due to the fact three phases of vapor, liquid, and solid coexist when you look at the one element, liquid.
    • the rule which states your few quantities of freedom in something at balance equals the number of components without the quantity of phases plus 2
  • others:
    • A generalization pertaining to systems of substance equilibrium, discovered by Prof. J. Willard Gibbs. It may possibly be reported hence: The degree of variableness (few examples of freedom) of a system is equivalent to the amount of components without the quantity of stages, plus two. Thus, if elements be salt and water, and the levels salt, ice, saturated option, and vapor, the system is invariant, that is, there clearly was one set of circumstances under which these four stages can occur in balance. If only three stages be considered, the device is univariant, that is, the rectifying of just one condition, as temperature, determines others.
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