the principle that equal volumes of all gases (given the same temperature and pressure) contain equal numbers of molecules

Plural form of volume

Plural form of topic, That branch of logic or rhetoric which treats of topics in the sense of topic, n, The most general, fundamental, and naturally elementary branch of geometry, which neither considers lengths, areas, or volumes in their character of being measurable, nor distinguishes straight from curved or crooked lines, nor plane from curved or bent surfaces, but studies only the manner in which the parts of places are continuously connected

A comprehensive reference work containing articles on a wide range of subjects or on numerous aspects of a particular field, usually arranged alphabetically, a reference work (often in several volumes) containing articles on various topics (often arranged in alphabetical order) dealing with the entire range of human knowledge or with some particular specialty, In a narrower sense, a cyclopedia See cyclopedia