## Conservation law

In physics , a **conservation** law states that a particular measurable property of an isolated physical system does not change as the system evolves. One particularly important physical result concerning **conservation** laws is Noether's Theorem , which states that there is a one-to-one correspondence

**wikipedia.org**| 2010/9/25 16:13:52

## Architectural conservation

Architectural **conservation** deals with issues of prolonging the life and integrity of architectural character and integrity, such as form and style, and/or its constituent materials, such as stone, brick, glass, metal, and wood. In this sense, the term refers to the "professional use of a combination

## Conservation of energy

The law of **conservation** of energy is a law of physics. It states that the total amount of energy in a system remains constant over time (is said to be conserved over time). A consequence of this law is that energy can neither be created nor destroyed: it can only be transformed from one

**wikipedia.org**| 2011/5/25 22:08:37

## Conservation of mass

The law of **conservation** of mass , also known as the principle of mass/matter **conservation** , states that the mass of a closed system (in the sense of a completely isolated system) will remain constant over time. This principle is equivalent to the **conservation** of energy, in the sense when

**wikipedia.org**| 2011/9/30 0:13:12

## Angular momentum coupling

In astronomy , spin-orbit coupling reflects the general law of **conservation** of angular **momentum** , which holds for celestial systems as well. In simple cases, the direction of the angular **momentum** vector is neglected, and the spin-orbit coupling is the ratio between the frequency with

**wikipedia.org**| 2011/5/10 20:48:17

## Four-momentum

In special relativity , four **momentum** is the generalization of the classical three-dimensional **momentum** to four-dimensional spacetime . **Momentum** is a vector in three dimensions; similarly four **momentum** is a four-vector in spacetime . The contravariant four **momentum** of a particle with

**wikipedia.org**| 2011/10/4 12:11:55