Talk:Phi

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Grain Size

Phi is a symbol used when describing grain size in sedimentology. Wentworth and Krumbian scales both use φ to describe the size of individual sediment particles.

This should be added to the list of scientific measurements that utilize phi.

See more here: https://en.wikipedia.org/wiki/Grain_size

Semi-protected edit request on 27 February 2019

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Upper Case Phi is also used in electrical power engineering a short hand for phase (as in Single Phase = 1Φ, Three Phase = 3Φ, Six Phase = 6Φ) 203.26.73.3 (talk) 05:08, 27 February 2019 (UTC)[reply]

Already in the article - "The number of phases in a power system in electrical engineering, for example 1Φ for single phase, 3Φ for three phase." ‑‑ElHef (Meep?) 15:42, 27 February 2019 (UTC)[reply]

This is not at all true. Φ is reserved in electrical engineering for magnetic flux. I can find no documentation in IEEE, NSPE, NCEES that uses Φ for phase. It would be incredibly confusing to use the same symbol. Electrical Engineering uses the symbol Ø. In mathematics phase can be denoted by Φ,θ,or Ø. Because Φ is flux and θ is phase angle, Ø is used to denote phase. Yet when you type in 'symbol for electrical phase' this page pops up first. This referenced claim needs to be fixed ASAP. 74.124.124.66 (talk) 19:57, 20 May 2020 (UTC)[reply]

Pronunciation

The article claims: The modern Greek pronunciation of the letter is sometimes encountered in English (as /fiː/) when the letter is being used in [the mathematical/scientific] sense. There is no source for this claim (unless it's the book, which I can't verify). It seems more likely to me that the editor who wrote this heard scientists / mathematicians whose first language is not English simply using their native pronunciations while speaking English. Hairy Dude (talk) 12:55, 28 February 2019 (UTC)[reply]

I have personally heard native English speakers pronounce it that way, both scientists and classicists. — Preceding unsigned comment added by 68.172.33.135 (talk) 15:29, 9 March 2019 (UTC)[reply]