Conservation of energy: ke revisions ke biich ke antar

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== Duusra websites ==
 
* [http://web.archive.org/web/20051023005506/http://35.9.69.219/home/modules/pdf_modules/m158.pdf <small>MISN-0-158</small> ''The First Law of Thermodynamics''] (PDF file) by Jerzy Borysowicz for [http://www.physnet.org Project PHYSNET].
 
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