In that law, Newton states that when you add up all of the forces acting on an object, … Definition of Mass. mass [mas] 1. a lump or collection of cohering particles. Mass is a measure of the amount of matter in an object. Compounds have mass, and this is what we call the molar mass. Suppose that there are two seemingly identical bricks at rest on the physics lecture table. See more. Scientists estimate that the total mass of the universe is between 10 52 kg and 10 53 kg. The word "mass" comes from the Greek word "maza" meaning "lump of dough." Mass is introduced in physics in Newton's Second Law of Motion. Central to the concept of mass is the concept of inertia. In solids especially in crystalline materials, electrons move in a periodic potential of the lattice. Mass is usually measured in grams (g) or kilograms (kg). Conservation of mass definition, the principle that in any closed system subjected to no external forces, the mass is constant irrespective of its changes in form; the principle that matter cannot be created or destroyed. Definitions of mass often seem circular because it is such a fundamental quantity that it is hard to define in terms of something else. Mass definition is - the liturgy of the Eucharist especially in accordance with the traditional Latin rite. Synonym Discussion of mass. Interesting Facts about Mass and Weight. inner cell mass an internal cluster of cells at the embryonic pole of the blastocyst which develops into the body of the embryo. This parameter can be expressed using several different units, including kilograms per meter cubed (kg/m 3) and pounds per square foot (lb/ft 2).Mass density is represented by the lower-case Greek letter rho, ρ, although the Latin letter 'D' has also historically been used. View bio. All physical objects resist changes to their states of motion. The more inertia that an object has, the more mass that it has. Mass is a quantity that is solely dependent on an object or system's resistance to change. The mass of an object is a fundamental property of the object; a numerical measure of its inertia; a fundamental measure of the amount of matter in the object. A more massive object has a greater tendency to resist changes in its state of motion. The mass density of an object is defined as its mass per unit volume. In modern physics, mass is definitely not defined in terms of matter, and there is no circularity.. What we classically called mass was really a definition of its effects on and by other objects. Inertia is the name of this resistance. Mass is a fundamental property of matter, which is anything that has mass and takes up space. Symbol m. atomic mass atomic weight; see also atomic mass unit. He has taught high school chemistry and physics for 14 years. 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