For example, the increase in rotational speed of a spinning figure skater as the skater's arms are contracted is a consequence of conservation of angular momentum.

The very high rotational rates of neutron stars can also be explained in terms of angular momentum conservation.

Moreover, angular momentum conservation has numerous applications in physics and engineering ( e. g. the gyrocompass ).

An example of angular momentum conservation.

The law of conservation of angular momentum states that when no external torque acts on an object or a closed system of objects, no change of angular momentum can occur.

The conservation of angular momentum explains the angular acceleration of an ice skater as she brings her arms and legs close to the vertical axis of rotation.

The conservation of angular momentum in Earth – Moon system results in the transfer of angular momentum from Earth to Moon ( due to tidal torque the Moon exerts on the Earth ).

When a body is acted upon by external contact forces, internal contact forces are then transmitted from point to point inside the body to balance their action, according to Newton's second law of motion of conservation of linear momentum and angular momentum ( for continuous bodies these laws are called the Euler's equations of motion ).

For example, the conservation of energy follows from the time-invariance of physical systems, and the fact that physical systems behave the same regardless of how they are oriented in space gives rise to the conservation of angular momentum.

Because of the absence of a net force in the azimuthal direction, conservation of angular momentum allows the radial component of this equation to be expressed solely with respect to the radial coordinate, r, and the angular momentum, yielding the radial equation ( a " fictitious one-dimensional problem " with only an r dimension ):

The speed of rotation – and therefore the total amount of rotation – may be varied from moment to moment by changing the shape of the body, in accordance with the law of conservation of angular momentum.

This " post-glacial rebound " brings mass closer to the rotation axis of the Earth, which makes the Earth spin faster ( law of conservation of angular momentum ): the rate derived from models is about − 0. 6 ms / day / cy.

* conservation of angular momentum,

Due to angular momentum conservation, states of the same ℓ but different m have the same energy ( this holds for all problems with rotational symmetry ).

There is conservation of the air's angular momentum.

There is no explanation for the particular values that physical constants appear to have throughout our universe, such as Planck's constant h or the gravitational constant G. Several conservation laws have been identified, such as the conservation of charge, momentum, angular momentum and energy ; in many cases, these conservation laws can be related to symmetries or mathematical identities.

When they rope out, the length of their funnel increases, which forces the winds within the funnel to weaken due to conservation of angular momentum.

The propagation of sound waves in a fluid ( such as water ) can be modeled by an equation of motion ( conservation of momentum ) and an equation of continuity ( conservation of mass ).

The equations for the conservation of linear momentum for a fluid medium are

The equations for the conservation of momentum may then be written as

The equation for the conservation of mass for an acoustic medium can also be derived in a manner similar to that used for the conservation of momentum.

The equations for the conservation of momentum may then be written as

In terms of components, these three equations for the conservation of momentum in cylindrical coordinates are

The acoustic equations for the conservation of momentum and the conservation of mass are often expressed in time harmonic form ( at fixed frequency ).

Substitution of these expressions into the governing equations in cylindrical coordinates gives us the fixed frequency form of the conservation of momentum

Due to the conservation of momentum requiring the parent nucleus to recoil, the effect acts much like the ' kick ' of a rifle butt when a bullet goes in the opposite direction.

Aerodynamics allows the definition and solution of equations for the conservation of mass, momentum, and energy in air.

The conservation of momentum equations are often called the Navier-Stokes equations, while others use the term for the system that includes conversation of mass, conservation of momentum, and conservation of energy.

Angular momentum is conserved in a system where there is no net external torque, and its conservation helps explain many diverse phenomena.

A stream which has all of its watershed within a national forest or other lands under good conservation practices is less likely to be affected by pollution than one passing through unrestricted logging or past an industrial area.

What follows is therefore a description of three separate undertakings, the new frescoing of the gap, and the successive essays in conservation, with some discussion of problems that arose in connection with each.

He contends this idea doesn't conflict with experiments on which the principle of conservation of matter and energy is based because some slight error must be assumed in such experiments.

The Amphibian Specialist Group of the World Conservation Union ( IUCN ) is spearheading efforts to implement a comprehensive global strategy for amphibian conservation.

Amphibian Ark is an organization that was formed to implement the ex-situ conservation recommendations of this plan, and they have been working with zoos and aquaria around the world encouraging them to create assurance colonies of threatened amphibians.

One such project is the Panama Amphibian Rescue and Conservation Project that built on existing conservation efforts in Panama to create a country-wide response to the threat of chytridiomycosis.

In addition, he included the farm as a place of conservation and is considered an agrarian scholar.

Any quantity of energy absorbed by the electron in excess of this amount is converted to kinetic energy according to the conservation of energy.

The equation for the conservation of mass in a fluid volume ( without any mass sources or sinks ) is given by

In quantum field theory, this process is allowed only as an intermediate quantum state for times short enough that the violation of energy conservation can be accommodated by the uncertainty principle.

The conservation status of the species is good, except for the Scandinavian mainland population.

Conservation-restoration ( also referred to as conservation and restoration or simply conservation ) is a profession devoted to the preservation of cultural heritage for the future.

The early development of conservation in any area of the world is usually linked to the creation of positions for chemists within museums.

The development of this department at the British Museum moved the focus for the development of conservation from Germany to Britain, and in 1956 Plenderleith wrote a significant handbook called The Conservation of Antiquities and Works of Art, it was this book rather than Rathgen's that is commonly seen as the major source for the development of conservation as we know it today.

Preventive conservation is an important element of museum policy and collections care.

One of the guiding principles of conservation has traditionally been the idea of reversibility, that is that all interventions with the object should be fully reversible, and the object should be able to be returned to the state in which it was prior to the conservators intervention.

Although this concept remains a guiding principle of the profession, it is a concept that has been widely critiqued within the conservation profession and is now considered by many to be " a fuzzy concept ".

Another important principle of conservation is that all alterations should be well documented and should be clearly distinguishable from the original object.

The results of this work was the report A Public Trust at Risk: The Heritage Health Index Report on the State of America's Collections, which was published in December 2005 and concluded that immediate action is needed to prevent the loss of 190 million artifacts that are in need of conservation treatment.

In November 2008, the UK based think tank Demos published an influential pamphlet entitled ' It's a material world: caring for the public realm ', in which they argue for integrating the public directly into efforts to conserve material culture, particularly that which is in the public, their argument, as stated on page 16, demonstrates their belief that society can benefit from conservation as a paradigm as well as a profession:

For some specializations within conservation this is still the case.

However, it is more common in the field of conservation today that the training required to become a practicing conservator comes from a recognized university course in conservation.