Fr.: conservation, préservation
The act or an instance of conserving.
Verbal noun of → conserve.
qânun-e pâyeš, ~ pâyandegi
Fr.: loi de conservation
A general statement that a physical quantity, such as energy, momentum, mass, or charge is unchanged in an interaction occurring within a → closed system. See also → conservation of charge, → conservation of energy, → conservation of mass, → conservation of mass and energy, → conservation of matter, → conservation of momentum, → conservation of probability, → parity conservation, → conservative field.
conservation of charge
Fr.: conservation de charge
conservation of energy
Fr.: conservation d'énergie
conservation of mass
Fr.: conservation de masse
A → principle of → classical physics whereby → matter can be neither created nor destroyed. Matter can, however, be → converted into → energy, as predicated by the theory of → special relativity. Also called → conservation of matter.
conservation of mass and energy
pâyeš-e jerm o kâruž
Fr.: conservation de masse et d'énergie
conservation of matter
Fr.: conservation de matière
Same as → conservation of mass.
conservation of momentum
Fr.: conservation de quantité de mouvement
A fundamental law of physics which states that the momentum of a → physical system does not change in the course of time if there are no external forces acting on the system. It is embodied in → Newton's first law. This principle shows that the interaction of bodies composing a → closed system leads only to an exchange in momentum between the bodies but does not affect the motion of the system as a whole. More specifically, interactions between the composing bodies do not change the velocity of the system's → center of mass.
conservation of probability
pâyeš-e šavânâyi, pâyandegi-ye ~
Fr.: conservation de probabilité
A principle according to which the sum of probabilities of all possible states that might come out of an initial state equals the probability of the initial state.
pâyeš-e hamâli, pâyandegi-ye ~
Fr.: conservation de parité
In quantum mechanics, the condition of parity in strong and electrodynamic interactions, where it remains constant and does not change with time. In other words, parity conservation implies that Nature is symmetrical and makes no distinction between right- and left-handed rotations or between opposite sides of a subatomic particle. Thus, for example, two similar radioactive particles spinning in opposite directions about a vertical axis should emit their decay products with the same intensity upward and downward. Same as → parity symmetry.