# Talk:Energy

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The article states that energy, like matter, cannot be created or destroyed; this is not quite true. Matter can be converted into energy, and vice versa. For example, the antimatter-matter annihilation mentioned in the article converts 2 kg of matter (and 1kg of antimatter) into $1.8\times10^{17}$ J. Mass-energy conversion also happens in nuclear fusion and fission. Though it is incorrect to talk about the conservation of matter or the conservation of energy, it is correct to talk about the conservation of mass/energy.--92.20.215.125 20:16, June 9, 2010 (UTC)