Re: Does water density increase in deeper ocean?


<dillogimp@xxxxxxxxx> wrote in message
news:1162024819.877991.139120@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Androcles wrote:
<dillogimp@xxxxxxxxx> wrote in message
news:1162019621.892691.174970@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
| hi
|
| Does water density increase in deeper ocean? (mass/volume)
| Thanks


No, water is not compressible. Pressure will increase, but not density.
Interestingly, ice is less dense that water, which is why it floats.
Androcles

Realistically? My homework assignment wants me to assume:
Pressure = density * height
But I don't know how to mentally derive this formula so that I don't
have to memorize it.
It seems more intuitive to believe water in deeper ocean is denser.


Does it look as though your assignment wants you to assume that the water is
at constant temperature and composition as you get deeper ? If so, then you
can probably ignore the minor effect of increasing density with depth. Know
it's there, and maybe add a line after your answer to explain why your
answer would need a correction.

The pressure is the weight of the water (in Newtons) above each square metre
of surface, which is (density * volume * g) divided by area.

I'm a bit concerned that your formula is using wrong units for density (I
suspect you are american and are using 'pounds per cubic foot' as a unit of
density, in which case you are in danger of getting into the mass - weight
confusion) Density is generally measured in 'Mass per unit of volume' rather
than 'weight per unit of volume'.

Anyway, hopefully you can see that the volume of a column divided by the
area of the base gives you the height of the column, which is
where your Pressure = density x height formula comes from.


.

Relevant Pages

  • Homebrew Digest #5359 (July 01, 2008)
    ... FORUM ON BEER, HOMEBREWING, AND RELATED ISSUES ... THIS YEAR'S HOME BREW DIGEST BROUGHT TO YOU BY: ... Re: Water Chemistry ... Yeast Performance Versus Pressure ...
    (rec.crafts.brewing)
  • Re: ALL the oceanic crust is recycled in 180 My: unrealistic
    ... becoming more mafic with increasing pressure, ... that material is rich in water because it forms andesitic magmas. ... You brought it up, floppy. ...
    (sci.geo.geology)
  • Re: Why are very large trees tall?
    ... to transport water. ... Get a glass of water and a straw. ... your experiment does not involve negative pressure unless the ... very fine hydrophobic lines, surrounding hydrophilic cells. ...
    (talk.origins)
  • Re: ALL the oceanic crust is recycled in 180 My: unrealistic
    ... with decreasing pressure. ... that material is rich in water because it forms andesitic magmas. ... It forms mainly from water saturated mantle that form ...
    (sci.geo.geology)
  • Re: EL NINO OR LA NINA causes which type of weather?
    ... What it is is the pressure differences between Low pressure areas and ... statistical evidence for widespread climatic anomalies around the ... the westward trade winds typically blow more intensely along ... the equator in the equatorial Pacific, causing warm upper-ocean water ...
    (sci.geo.meteorology)