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<blockquote data-quote="freyar" data-source="post: 5121681" data-attributes="member: 40227"><p>This is the easier example. If you caught up with all the molecules released by burning wood,</p><p>then yes, you'd have the same mass as you started with (minus a tiny amount that became heat/kinetic energy, as Umbran mentioned). Chemical reactions are pretty much just about rearranging mass with very little mass turned into (other forms of) energy.</p><p></p><p></p><p>Breathing and sweating gets rid of some mass: sweating takes water out of your body, which then evaporates away. Breathing also does the same (though not as effectively). Your loss of body heat also gets rid of mass/energy, but, as noted, it's a completely negligible amount. Here's the deal as best as I can figure: the bulk of what you eat (in terms of mass) passes right through. Some fraction is used just to build/rebuild chemical structures in your body, including storage as fat. Only a very tiny amount (again, negligible as Umbran says) is used to power you (exercise, keeping your body temperature above room temperature, etc).</p></blockquote><p></p>
[QUOTE="freyar, post: 5121681, member: 40227"] This is the easier example. If you caught up with all the molecules released by burning wood, then yes, you'd have the same mass as you started with (minus a tiny amount that became heat/kinetic energy, as Umbran mentioned). Chemical reactions are pretty much just about rearranging mass with very little mass turned into (other forms of) energy. Breathing and sweating gets rid of some mass: sweating takes water out of your body, which then evaporates away. Breathing also does the same (though not as effectively). Your loss of body heat also gets rid of mass/energy, but, as noted, it's a completely negligible amount. Here's the deal as best as I can figure: the bulk of what you eat (in terms of mass) passes right through. Some fraction is used just to build/rebuild chemical structures in your body, including storage as fat. Only a very tiny amount (again, negligible as Umbran says) is used to power you (exercise, keeping your body temperature above room temperature, etc). [/QUOTE]
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