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(I) Temperature and Thermometers
(I) Temperature and Thermometers

...  The space between the glass walls is a vacuum.  The facing walls of the evacuated space inside are silvered.  The mouth of the flask is covered with a stopper made of good insulator.  The stopper and the vacuum between the silvered walls reduce transfer of heat by conduction and convection; the ...
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Conservation of energy



In physics, the law of conservation of energy states that the total energy of an isolated system remains constant—it is said to be conserved over time. Energy can be neither created nor be destroyed, but it transforms from one form to another, for instance chemical energy can be converted to kinetic energy in the explosion of a stick of dynamite.A consequence of the law of conservation of energy is that a perpetual motion machine of the first kind cannot exist. That is to say, no system without an external energy supply can deliver an unlimited amount of energy to its surroundings.
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