Guille & Dave
You have given me even more to think about before i reply. Especially about the words ENTITY & SPACETIME ....
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Originally Posted by dleviwing Though you will not find it in physics books, "mass" is a measure of the potential energy of a system and not the physical quantity of matter in that system. This is why mass and energy are identical.
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Actually I have found this in nearly all Physics Books .... here is one examle of many
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'In high school physics, an object with a certain mass and a certain velocity is said to have kinetic energy (energy by virtue of motion) Objects have energy also by virtue of where they are. A steel ball on top of the ears Tower has potential energy because someone worked hard to get it there. If you drop it off the tower, it will, in falling trade in its potential energy for kinetic energy .... [The GOD Particle, Leon Lederman, 1993
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Leon Lederman was head of Fermilab (i think) and had won a Nobel prize
Please don't think I am contentious, its just that i find i learn more when things are clarified for me... Its hard to communicate complex ideas when you only have a few lines of post.
When you said your definition would not be found in Physics books was this what you meant or have i got it wrong.
Also i am working on my reply to your definition of SpaceTime, please be patient with me
TA! greg