I
Celebration of the Eucharist in the Roman Catholic church.
It is considered a sacramental reenactment of the death and resurrection of Jesus as well as a true sacrifice in which the body and blood of Jesus (the bread and wine) are offered to God. It is also seen as a sacred meal that unifies and nourishes the community of believers. The mass includes readings from Scripture, a sermon, an offertory, a eucharistic prayer, and communion. The rite was greatly changed after the Second sacrament , transubstantiation .
II
Quantitative measure of inertia , or the resistance of a body to a change in motion.
The greater the mass, the smaller is the change produced by an applied force. Unlike weight , the mass of an object remains constant regardless of its location. Thus, as a satellite moves away from the gravitational pull of the Earth, its weight decreases but its mass remains the same. In ordinary, classical chemical reactions, mass can be neither created nor destroyed. The sum of the masses of the reactants is always equal to the sum of the masses of the products. For example, the mass of wood and oxygen that disappears in combustion is equal to the mass of water vapour, carbon dioxide, smoke, and ash that appears. However, Albert Einstein 's special theory of relativity shows that mass and energy are equivalent, so mass can be converted into energy and vice versa. Mass is converted into energy in nuclear fusion and nuclear fission . In these instances, conservation of mass is seen as a special case of a more general conservation of mass-energy. See also critical mass .
III
[c mediumvioletred] (as used in expressions)
air mass
critical mass
Einstein's mass energy relation
mass action law of
mass flow
mass movement
mass wasting
mass production
mass spectrometry
mass spectroscopy
{{link=mass transit">mass transit
requiem mass