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.
the principle that the total mass of any isolated system is constant and is independent of any chemical and physical changes taking place within the system
conservation of mass
A principle of classical physics stating that the total mass of a closed system is unchanged by interaction of its parts. The principle does not hold under Special Relativity, since mass and energy can be converted into one another.
- Law of contiguity
law of contiguity n. The principle that when two ideas or psychologically perceived events have once occurred in close association, they are likely to occur in close association again, the subsequent occurrence of one tending to elicit the other.
noun, Logic. 1. the law that a proposition cannot be both true and false or that a thing cannot both have and not have a given property.
noun, Trigonometry. 1. a law stating that the square of a side of a plane triangle is equal to the sum of the squares of the other two sides minus twice the product of the other sides multiplied by the cosine of the angle between them. 2. a law stating that the cosine of an […]
noun, Economics. 1. the law that for a single consumer the marginal utility of a commodity diminishes for each additional unit of the commodity consumed.