Final answer:
A tritone is dissonant and unstable, while a P5 is consonant and stable.
Step-by-step explanation:
A tritone is an interval that spans three whole tones or six semitones. It is often called the 'devil's interval' due to its dissonant sound. For example, the distance between C and F# is a tritone.
A P5, on the other hand, is a perfect fifth and is an interval that spans five whole tones or ten semitones. It is considered a consonant and harmonically stable interval. For example, the distance between C and G is a P5.
In summary, the main difference between a tritone and a P5 is that a tritone is dissonant and unstable, while a P5 is consonant and stable.