Equation 99 · Part 1 · The Clock That Comes Back Wrong by Exactly Its Mass

Symbol Δ E

\Delta E/c^2

\Delta E

What this part means

the energy.

Its job in the formula

Δ E is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.

Full expressionSymbol Δ EArticle meaning

Where the article explains it

A composite system with an internal excitation of energy $\Delta$ E above its ground configuration carries additional rest mass $\Delta$ E/ $c^2$ , by ordinary mass–energy equivalence — no redefinition of either the relativistic or the everyday meaning of mass, simply the standard bookkeeping in which a system’s total rest energy M $c^2$ includes whatever internal energy $H_{\rm int}$ it holds: M= $M_0$ + $H_{\rm int}$ / $c^2$ .

The passage around this formula

… $L_{\rm P}$ is where mass stops being a fixed label and becomes something an object can carry a little more or less of depending on what it is doing internally. A composite system with an internal excitation of energy $\Delta$ E above its ground configuration carries additional rest mass $\Delta$ E/ $c^2$ , by ordinary mass–energy equivalence — no redefinition of either the relativistic or the everyday meaning of mass, simply the standard bookkeeping in which a system’s total rest energy M $c^2$ includes whatever internal…

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Learn the underlying idea

A variable is a named place for a value. Its letter is a local label: x can mean position in one formula and a data point in another.

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Sources cited in the article section

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