φ, Phi, phonetic symbol /fa? /。 According to the Greek alphabet pronunciation table of Modern Chinese Dictionary, the Chinese pronunciation of φ is "Fei". In the application of physical scope, the phonetic symbol is /fi:/.

This is the 2nd1Greek letter.

As a Greek lowercase letter, the bend in the upper left corner is φ of the opening; When used as a symbol, you usually write? (U+03D5).

Extended data:

Lowercase letters:

1, physics

1) magnetic flux or potential, lowercase? φ。

2) electricity consumption? φ? Say, glasses degree = 100*φ. The power of convex lens (hyperopia lens) is positive, and that of concave lens (myopia lens) is negative.

2. Mathematics

1) represents the translation size from left to right in the function y=Asin(wφ+φ).

2) The included angle between the straight line and the z axis in three-dimensional coordinates.

3) Volume fraction, with the symbol φ, refers to the substance? b？ When the volume fraction, symbol. φB or? φ(B), defined as: φB=V8÷V0.

3. Engineering

Indicates the diameter of the cylindrical material device. For example, φ 10 is 10 unit diameters.

Baidu Encyclopedia-φ