law of reciprocal proportions chemistry Ask the Chatbot a Question More Actions Share Share Share to social media Facebook X URL https://www.britannica.com/science/law-of-reciprocal-proportions-chemistry Feedback Corrections? Updates? Omissions? Let us know if you have suggestions to improve this article (requires login). Feedback Type Select a type (Required) Factual Correction Spelling/Grammar Correction Link Correction Additional Information Other Your Feedback Submit Feedback Thank you for your feedback Our editors will review what you’ve submitted and determine whether to revise the article.

　　External Websites Ask the Chatbot a Question Written and fact-checked by The Editors of Encyclopaedia Britannica Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. They write new content and verify and edit content received from contributors. The Editors of Encyclopaedia Britannica Last Updated: Mar 26, 2025 • Article History Table of Contents Table of Contents Ask the Chatbot Also called: law of equivalent proportions (Show more) law of reciprocal proportions, in chemistry, the statement that if the same weight of one element combines separately with two other elements, then the weights of those two elements that combine with each other are related to the weights that combine with the first element by a multiple or a simple fraction. Two atoms of hydrogen (H) and one atom of oxygen (O) make water (H2O). Using the atomic weights of hydrogen and oxygen as 1 and 16, respectively, 2 grams of hydrogen combine with 16 grams of oxygen to make water. That is, 1 gram of hydrogen combines with ...(100 of 238 words)

　　Access the full article Help support true facts by becoming a member. Subscribe today!