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<blockquote data-quote="Umbran" data-source="post: 5122573" data-attributes="member: 177"><p>Yes. The general posit is, "Matter and energy can not be created nor destroyed, but only converted."</p><p></p><p>So, there was some energy stored in the chemical bonds ("chemical potential energy"). When released it most usually becomes another form of energy. If you use food energy to lift a heavy box onto a high shelf, the chemical potential energy gets converted into potential energy of position of the box. If you throw a baseball, it gets turned into kinetic energy of the ball.</p><p></p><p>Most of the energy released eventually finds its way into heat - random motion of molecules and atoms. The thrown baseball eventually hits the ground, and dissipates it's kinetic energy through friction with the ground, and heats the ground and itself ever so slightly.</p><p></p><p></p><p></p><p>For most human intents and purposes, yes, the mass of the original wood would equal the mass of ash, gases released and oxygen used in burning.</p><p></p><p>As a minor technicality - do note that our measuring techniques have limits. There are mass differences so small that we cannot measure them. My home scale only displays differences down to about 1/8th of an ounce, for example. If less than 1/8th of an ounce of mass were missing, I'd not notice it. Even the best-made scientific scales have limits on their precision.</p></blockquote><p></p>
[QUOTE="Umbran, post: 5122573, member: 177"] Yes. The general posit is, "Matter and energy can not be created nor destroyed, but only converted." So, there was some energy stored in the chemical bonds ("chemical potential energy"). When released it most usually becomes another form of energy. If you use food energy to lift a heavy box onto a high shelf, the chemical potential energy gets converted into potential energy of position of the box. If you throw a baseball, it gets turned into kinetic energy of the ball. Most of the energy released eventually finds its way into heat - random motion of molecules and atoms. The thrown baseball eventually hits the ground, and dissipates it's kinetic energy through friction with the ground, and heats the ground and itself ever so slightly. For most human intents and purposes, yes, the mass of the original wood would equal the mass of ash, gases released and oxygen used in burning. As a minor technicality - do note that our measuring techniques have limits. There are mass differences so small that we cannot measure them. My home scale only displays differences down to about 1/8th of an ounce, for example. If less than 1/8th of an ounce of mass were missing, I'd not notice it. Even the best-made scientific scales have limits on their precision. [/QUOTE]
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