phase rule

noun

Definition of phase rule 

: a law in physical chemistry: the number of degrees of freedom of a system in equilibrium is equal to the number of components minus the number of phases plus the constant two (as in the system ice -liquid water- water vapor consisting of the one chemical component water and its three physical phases there are no degrees of freedom and the system can exist at only one temperature and pressure)

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

Learn More about phase rule

Share phase rule

Statistics for phase rule

Look-up Popularity

Comments on phase rule

What made you want to look up phase rule? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

to clear from alleged fault or guilt

Get Word of the Day daily email!

Test Your Vocabulary

Difficult Vocab Quiz

  • the-education-of-achilles-eugne-delacroix
  • Which is a synonym of discomfit?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
Dictionary Devil

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!