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Mass, in Christianity
(Encyclopedia)Mass, religious service of the Roman Catholic Church, which has as its central act the performance of the sacrament of the Eucharist. It is based on the ancient Latin liturgy of the city of Rome, now ...bibliography
(Encyclopedia)bibliography. The listing of books is of ancient origin. Lists of clay tablets have been found at Nineveh and elsewhere; the library at Alexandria had subject lists of its books. Modern bibliography b...Christianity
(Encyclopedia)Christianity, religion founded in Palestine by the followers of Jesus. One of the world's major religions, it predominates in Europe and the Americas, where it has been a powerful historical force and...canon, in Christianity
(Encyclopedia)canon, in Christianity, in the Roman Catholic Church, decrees of church councils are usually called canons; since the Council of Trent the expression has been especially reserved to dogmatic pronounce...critical mass
(Encyclopedia)critical mass: see chain reaction. ...atomic mass
(Encyclopedia)atomic mass, the mass of a single atom, usually expressed in atomic mass units (amu). Most of the mass of an atom is concentrated in the protons and neutrons contained in the nucleus. Each proton or n...mass extinction
(Encyclopedia)mass extinction, the extinction of a large percentage of the earth's species, opening ecological niches for other species to fill. There have been at least ten such events. The five greatest were thos...mass number
(Encyclopedia)mass number, often represented by the symbol A, the total number of nucleons (neutrons and protons) in the nucleus of an atom. All atoms of a chemical element have the same atomic number (number of pr...mass production
(Encyclopedia)mass production: see production. ...mass spectrograph
(Encyclopedia)mass spectrograph, device used to separate electrically charged particles according to their masses; a form of the instrument known as a mass spectrometer is often used to measure the masses of isotop...Browse by Subject
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