instantaneous sound pressure


  • WordNet 3.6
    • n instantaneous sound pressure the difference between the instantaneous pressure at a point in a sound field and the average pressure at that point
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In science:

Also, in contrast to the Jeans mass, the filtering mass depends on the full thermal history of the gas instead of the instantaneous value of the sound speed, so it accounts for the finite time required for pressure to influence the gas distribution in the expanding universe.
The First Cosmic Structures and their Effects