Meaning & use
Bivariant
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Having two degrees of freedom; in physical chemistry, describing a system (under the phase rule) that can have two independent variables, such as temperature and pressure, changed without altering the number of phases present.
See it in a sentence
A bivariant system allows chemists to vary both temperature and pressure while the same phases remain in equilibrium.
The Gibbs phase rule identifies which regions of a phase diagram are bivariant.
A note on using this word
"Bivariant" is a technical term from the Gibbs phase rule in thermodynamics, distinguishing systems with two degrees of freedom from univariant or invariant ones.
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