Science Fair Project Encyclopedia
The musical interval of a perfect fifth is the relationship between the first note (the root or tonic) and the fifth note in a major scale. It is the inversion of the perfect fourth. Its abbreviation is P5.
It can be produced by starting on a high note and playing the fifth below or by starting on a low note and playing the fifth above.
A perfect fifth in just intonation most often corresponds to a pitch ratio of 2:3 or 1:1.5, or various other ratios, while in an equal tempered tuning, a perfect fifth is equal to seven (7) semitones, a ratio of 1:27/12 (approximately 1.4983), or 700 cents,two cents smaller.
The strings on violins, violas, and cellos are all tuned to perfect fifths unless in scordatura.
|# semitones||Interval class||# cents in equal temperament||Most common diatonic name||Comparable just interval||# cents in just interval||Just interval vs. equal-tempered interval|
|7||5||700||perfect fifth||3:2||702||2 cents larger|
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