373 Words Essay on Conservation of Energy
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In physics, the law of conservation of energystates that the total energy of an isolated system remains constant, it is said to be conserved over time.[1] This law means that energy can neither be created nor destroyed; rather, it can only be transformed or transferred from one form to another. For instance, chemical energy is converted to kinetic energy when a stick of dynamiteexplodes. If one adds up all the forms of energy that were released in the explosion, such as the kinetic energy of the pieces, as well as heat and sound, one will get the exact decrease of chemical energy in the combustion of the dynamite. Classically, conservation of energy was distinct from conservation of mass; however, special relativity showed that mass could be converted to energy and vice versa by E = mc2, and science now takes the view that mass–energy is conserved.
Scientifically speaking, conservation of energy can be rigorously proven by Noether's theorem as a consequence of continuoustime translation symmetry; that is, from the fact that the laws of physics do not change over time.
A consequence of the law of conservation of energy is that a perpetual motion machine of the first kind cannot exist, that is to say, no system without an external energy supply can deliver an unlimited amount of energy to its surroundings.[2] For systems which do not have time translation symmetry, it may not be possible to define conservation of energy. Examples include curved spacetimes in general relativity[3] or time crystals in condensed matter physics.[4][5][6][7]
Scientifically speaking, conservation of energy can be rigorously proven by Noether's theorem as a consequence of continuoustime translation symmetry; that is, from the fact that the laws of physics do not change over time.
A consequence of the law of conservation of energy is that a perpetual motion machine of the first kind cannot exist, that is to say, no system without an external energy supply can deliver an unlimited amount of energy to its surroundings.[2] For systems which do not have time translation symmetry, it may not be possible to define conservation of energy. Examples include curved spacetimes in general relativity[3] or time crystals in condensed matter physics.[4][5][6][7]
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.hay................Energy supplies can be extended by the conservation, or planned management, of currently available resources. There are three types of energy conservation practices. The first is curtailment; doing without. For instance, cutting back on travel to reduce the amount of gasoline burned. The second is overhaul; changing the way people live and the way goods and services are produced. For example, slowing further urbanization of society by using less energy-intensive materials in production processes and decreasing the amount of energy consumed by certain products such as cars. The third type is the more efficient use of energy; adjusting to higher energy costs. An example is investing in cars that go father per gallon or insulating houses. Societies most commonly adopt this option because it requires less drastic changes in lifestyle.
Increased energy efficiency helps the world energy balance and productive conservation is no less an energy alternative than the energy sources. Substantial energy savings began to occur in the United States in the 1970s when the federal government imposed a nationwide automobile efficiency standard and offered tax deductions for insulating houses and installing solar energy panels.
Some obstacles stand in the way of conserving energy. It requires hundreds of millions of people to do routine things such as turning off lights and keeping tires properly inflated. Also, the price of energy is very high. Low energy prices make it difficult to convince people to invest in energy efficiency. Over time, improvements in energy efficiency more than pay for themselves. They also, however, require large capital investments, which are not attractive when energy prices are low.
Increased energy efficiency helps the world energy balance and productive conservation is no less an energy alternative than the energy sources. Substantial energy savings began to occur in the United States in the 1970s when the federal government imposed a nationwide automobile efficiency standard and offered tax deductions for insulating houses and installing solar energy panels.
Some obstacles stand in the way of conserving energy. It requires hundreds of millions of people to do routine things such as turning off lights and keeping tires properly inflated. Also, the price of energy is very high. Low energy prices make it difficult to convince people to invest in energy efficiency. Over time, improvements in energy efficiency more than pay for themselves. They also, however, require large capital investments, which are not attractive when energy prices are low.
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