compression (physics)

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Region of a sound wave where the particles of the medium through which it is travelling have been pushed close together, initially by the vibrating object that is the source of the sound. Sound waves consist of alternate regions of compressions and rarefactions travelling away from the source.

The disc represents the full moon, traditionally the most auspicious time for work and celebration. The disc is set towards the hoist. Effective date: 1 January 1981. >>