ビリアル展てん開かいMeanings1nounvirial expansionphysicsTechnical term in physics for expressing a thermodynamic quantity as a power series in density.ビリアル展てん開かいは、実じつ在ざい気き体たいの状じょう態たい方ほう程てい式しきを記き述じゅつするのに使つかわれる。The virial expansion is used to describe the equation of state for real gases.