History of Energy - Conservation of Energy

Conservation of Energy

In 1918 it was proved that the law of conservation of energy is the direct mathematical consequence of the translational symmetry of the quantity conjugate to energy, namely time. That is, energy is conserved because the laws of physics do not distinguish between different moments of time (see Noether's theorem).

During a 1961 lecture for undergraduate students at the California Institute of Technology, Richard Feynman, a celebrated physics teacher and Nobel Laureate, said this about the concept of energy:

There is a fact, or if you wish, a law, governing natural phenomena that are known to date. There is no known exception to this law—it is exact so far we know. The law is called conservation of energy; it states that there is a certain quantity, which we call energy that does not change in manifold changes which nature undergoes. That is a most abstract idea, because it is a mathematical principle; it says that there is a numerical quantity, which does not change when something happens. It is not a description of a mechanism, or anything concrete; it is just a strange fact that we can calculate some number, and when we finish watching nature go through her tricks and calculate the number again, it is the same. —The Feynman Lectures on Physics

Read more about this topic:  History Of Energy

Other articles related to "conservation of, conservation, conservation of energy, energy, of energy":

Greater Crested Tern - Status
... cristata are covered under the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA) ... required to engage in a wide range of conservation strategies described in a detailed action plan ... The plan is intended to address key issues such as species and habitat conservation, management of human activities, research, education, and implementation ...
Conservation Of Energy - Mechanics - Quantum Theory
... In quantum mechanics, energy of a quantum system is described by a self-adjoint (Hermite) operator called Hamiltonian, which acts on the Hilbert space (o ... Thus the expectation value of energy is also time independent ... The local energy conservation in quantum field theory is ensured by the quantum Noether's theorem for energy-momentum tensor operator ...
Centrifugal Compressor - Aero-thermodynamic Fundamentals - Conservation of Energy
... The First Law of Thermodynamics is the statement of the conservation of energy ... Under specific conditions, the operation of a Centrifugal compressor is considered a reversible process ...
Orang Hutan - Conservation - Conservation Centres and Organisations
... Other major conservation centres in Indonesia include those at Tanjung Puting National Park and Sebangau National Park in Central Kalimantan, Kutai in East Kalimantan, Gunung Palung National Park in ... In Malaysia, conservation areas include Semenggoh Wildlife Centre in Sarawak and Matang Wildlife Centre also in Sarawak, and the Sepilok Orang Utan ... Major conservation centres that are headquartered outside of the orangutan's home countries include Orangutan Foundation International, which was founded by ...

Famous quotes containing the words conservation of, energy and/or conservation:

    A country grows in history not only because of the heroism of its troops on the field of battle, it grows also when it turns to justice and to right for the conservation of its interests.
    Aristide Briand (1862–1932)

    After the planet becomes theirs, many millions of years will have to pass before a beetle particularly loved by God, at the end of its calculations will find written on a sheet of paper in letters of fire that energy is equal to the mass multiplied by the square of the velocity of light. The new kings of the world will live tranquilly for a long time, confining themselves to devouring each other and being parasites among each other on a cottage industry scale.
    Primo Levi (1919–1987)

    The putting into force of laws which shall secure the conservation of our resources, as far as they may be within the jurisdiction of the Federal Government, including the more important work of saving and restoring our forests and the great improvement of waterways, are all proper government functions which must involve large expenditure if properly performed.
    William Howard Taft (1857–1930)