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Water surface rise or not

  1. Sep 6, 2014 #1
    When we look in the aquerium , the fish moves from here to there but there is no disturbance at the surface of water . Why is it so?

    My attempt
    Actually I think that this problem is due to permiability of water. Am I right or wrong?
     
  2. jcsd
  3. Sep 7, 2014 #2

    CWatters

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    permeability of water? Do you mean the compressibility of water? It's not that.

    If the fish is deep enough the disturbance at the surface has a small large radius. Water also flows quickly so it's self levelling.
     
  4. Sep 7, 2014 #3
    What do u mean by small large radius
     
  5. Sep 7, 2014 #4

    SteamKing

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    What do you mean by 'the permeability of the water'?
     
  6. Sep 7, 2014 #5
    I mean to say water flux
     
  7. Sep 8, 2014 #6

    CWatters

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    Sorry I made a typo. I meant

    If the fish is deep enough the disturbance at the surface has a large radius.
     
  8. Sep 8, 2014 #7
    But if the fish is at the near the surface than
     
  9. Sep 8, 2014 #8

    CWatters

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    http://www.evols.org/mediawiki/images/thumb/e/ed/BL-06-1-streamlined.png/250px-BL-06-1-streamlined.png [Broken]
     
    Last edited by a moderator: May 6, 2017
  10. Sep 8, 2014 #9

    olivermsun

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    There is indeed a disturbance at the surface of the water; it is usually negligibly small because the density difference between air and water is so big.
     
  11. Sep 8, 2014 #10

    HallsofIvy

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    Because of the viscosity of water, any time water moves, there is a loss of energy. If the fish is deep enough under the water, the energy will have dissipated by the time the disturbance reaches the surface.
     
  12. Sep 8, 2014 #11
    Thanx Cwatters and olivermsun I got it
     
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