定てい比ひ例れいの法ほう則そく

noun

law of definite proportions

A fundamental chemical principle stating that a given compound always contains its constituent elements in fixed mass ratios. Used in scientific contexts.

• 定てい比ひ例れいの法ほう則そくは、化か学がくの基き本ほん的てきな法ほう則そくの一ひとつです。

  The law of definite proportions is one of the fundamental laws of chemistry.