air mass |
a body of air that covers a wide area and has little horizontal variation in temperature, pressure, or moisture. |
atomic mass unit |
a unit equal to one twelfth of the mass of an atom of the most abundant kind of carbon, equal to 1.6605 times 1024 gram. |
center of mass |
the point at which the mass of an object or system of objects can be considered to be concentrated. |
critical mass |
the minimum mass of fissionable material necessary to sustain a nuclear chain reaction. [2 definitions] |
High Mass |
a Catholic mass in which parts of the text are sung by the celebrant, often with additional music, incense, and ceremony. (Cf. Low Mass.) |
Low Mass |
a mass that is recited, rather than sung, by one priest assisted by one acolyte. |
mass media |
those ways of communicating that reach large numbers of people, such as newspapers, magazines, television, and radio. |
mass meeting |
a large public meeting, called to discuss some matter of common concern or interest. |
mass noun |
a noun that denotes an abstract, uncountable entity and is not preceded by "a" or "an," such as "integrity," "filth," or "information". |
mass number |
the total number of neutrons and protons in the nucleus of an atom. |
mass production |
the making of goods in large numbers by means of machines or assembly lines. |
mass spectrograph |
an early type of mass spectrometer that records photographically rather than electronically. |
mass spectrometer |
an instrument used to determine the mass and abundance of charged particles in a prepared beam, by passing it through an electromagnetic field and electronically recording the distribution of particles, often for the purpose of chemical analysis. |
mass transit |
a system of public transportation that carries people from place to place within a city by bus and train. |
mass-produce |
to manufacture or produce in quantity, esp. in a factory by assembly line methods. |
rest mass |
the mass of a body when at rest. |