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Infrasound vs Hypersonic - What's the difference?

infrasound | hypersonic |

As a noun infrasound

is (physics) sound waves having frequency below the human audible range (below about 20 hz).

As an adjective hypersonic is

(of a speed|aviation) equal to, or greater than, or capable of achieving, five times the speed of sound.

infrasound

English

Noun

(wikipedia infrasound)
  • (physics) Sound waves having frequency below the human audible range (below about 20 Hz).

    • Related terms

    * infrasonic, infrasonics

    Antonyms

    * ultrasound

    hypersonic

    English

    (wikipedia hypersonic)

    Adjective

    (en adjective)
  • (of a speed, aviation) equal to, or greater than, or capable of achieving, five times the speed of sound.
  • (of a speed, aeronautics) far enough above the speed of sound as to cause significant differences in behaviour due to chemical reactions or disassociation of the air.

    • Related terms

    * plasmasonic * supersonic * transonic * subsonic