# What is the $\delta$ in fluctuation model [closed]

I found this formula : $G-G_0=\frac{-nkT}2\delta^2$ on this Site and I'd like to ask what does the $\delta$ stand for?

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## closed as too localized by Chris White, user1504, Qmechanic♦Jun 21 '13 at 18:20

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Read the next line. –  Dimensio1n0 Jun 21 '13 at 15:14

...where $\delta=\frac{V-V_0}{V_0}$ is the condensation (e.g. relative volume variation).
Dear user, I don't quite follow whether your question is serious. AFAIK none of the physics terminology or notation is derived from Czech. The Greek letter $\delta$ which is the Greek counterpart of "d" is used for a big fraction of quantities that look like a difference because the word difference starts with a "d" and "differentia" means "difference" in Latin, see etymonline.com/index.php?term=difference - Well, the more accurate story is that delta actually comes from Greek word διαφορά, diaphorá - also "difference". –  Luboš Motl Jun 22 '13 at 6:22