If one can turn matter into energy and vice versa, then would not one create either?
462106
Its called "law of conservation of Energy".. \nYou can covert matter of mass M into energy  (and energy will be MC^2).. but you can not create either.\n\nEnergy will chenge from one form to another form like heat, work, pressure...etc. All these are one way or the other  form of energy.\n\nFundamental concepts of classical physics will give you much better idea about this concept.Try it!
218567
There is no "close." You either have perpetual motion or you don't. Because any device you can come up with will have energy loss due to heat lost by the work done, you can never have a physical device that will keep going without additional energy. There is a theoretical particle that can never go slower than the speed of light, which I guess would be a form of perpetual motion, but it is not man-made.
468574
The conservation of energy rule in physics dictates that energy is always conserved, so it can't be destroyed merely changed to another type. Perhaps an example could be in a crash, the kinetic energy is turned into sound and heat energy primarily, but the energy still exists.
1101831
everything is made up of energy so if space is infinite then something must be there and if something is infinitely there then energy would be infinite
369216
matter is neither created nor destroyed
498628
Mostly because of, well, just the way the world works, and the laws of physics and all that. All energy is conserved and simply "transformed" into different kinds of energy. It is never created or destroyed.\n\nSpeaking of petroleum and all of that as previous posters have mentioned - this is merely the converting of different elements or matter into energy. This is not really "creating" energy, because the potential energy is always there, latent in the given element. It simply cannot be "used" yet. I hope that suffices as a layman explanation.
560909
Not really.  It's the movement of electrons, so they're different things, but without electrons, I don't think there would be electricity.  But if the same electrons are just sitting around, that's not electricity either.\n\nIt's like asking what's the mass of 55mph?  It doesn't really work like that.  Your car might be able to go 55mph but it has the same mass at 55mph as it does when it's not moving.
395234
if you go from A to be and then B to A you should have no overall energy change. one will be an exothermic reacion and the other should be endothermic reaction
853900
Matter and energy are part of the universe, just like time and space are, it a unit, really. \nAstrophysicists have proven that matter distorts space. If space is distorted, time is affected... Matter is also another form of energy, proven by the law of conservation.\n\nIts  like a cake, a cake needs all the ingredients mixed together in order to be a cake. Flour or sugar alone are not a cake.\nWhy would space be without time?\n\n\nI think only G-d knows, really!
552079
-the total is constant. One common phrasing of this is that energy cannot be created or destroyed.
594714
No, the amount is constant. It can change between different states though. Particles with some mass can change into energy in interactions and vice versa and there are many many different ways of energy changing from one to another.\n\nOn a school level you can think of "chemical energy" changing to kinetic energy in a car for example. At a higher level you need to consider more in-depth things like an electron loosing potential energy by moving down a level in orbit around an atom and emitting a photon with that energy so it is conserved.
169511
The energy does not become matter.  The partcles are the matter.  You, and everything around you, are mostly empty space.
333634
Theoretically yes. Object of any mass with enough speed would create this kind of energy. if we can accelerate the 2H and O atoms to the many times the speed of light til they collide with each other.It will release massive energy.\nThis is like the idea of cold fusion.
953904
No common denominator for the energy in the things you mention except that if it has mass, then it embodies the energy given in E = mc^2\n\nThis applies to ALL matter.
1140369
First Law of Thermodynamics: Energy can be changed from one form to another, but it cannot be created or destroyed. The total amount of energy and matter in the Universe remains constant, merely changing from one form to another. The First Law of Thermodynamics (Conservation) states that energy is always conserved, it cannot be created or destroyed. In essence, energy can be converted from one form into another. Click here for another page (developed by Dr. John Pratte, Clayton State Univ., GA) covering thermodynamics.\n\nok now to answer your question:\nWork=PV=nRT\nWork=(2moles)(8.32)(106-21)\nWork=1414.4J
511885
Energy can take the form of heat, light, vibration, momentum or sound. It can also be stored as potential energy. Anytime you interconvert among these forms of energy, you can say it is "transferred". Chemical reactions can include some or all of these, with chemical bonds representing stored potential energy.\n\nIn nuclear reactions, you can say that energy and matter are interconverted as well.
206102
They believe that matter and energy were created during the Big Bang, however, that raises for a lot more questions, the most obvious one being:\n\nHow can matter and energy be created?