Density depends on temperature, salinity and pressure, and seawater mixing changes those properties along a path. The model holds pressure fixed and uses a labelled illustrative comparison. Use it to distinguish a cause of vertical motion from wind-driven surface transport, while avoiding local current, navigation or climate predictions.
Water and oceans · Discover & try
What can move water across the ocean?
Reading level 5 of 5 · AdvancedChange
Word help
Density
Mass per unit volume.
Surface current
Water movement near the ocean surface, often strongly affected by wind.
Overturning
Circulation connecting shallower and deeper water.
Watch · Try · Explain
See how it works
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Conceptual wind and relative-density views; not a map or numerical seawater-density calculation.
What to look for
- Compare the parcel with surrounding water.
- Change temperature without changing salinity.
- Distinguish wind-driven surface movement from sinking.
Explain what you noticed
Two nearby parcels have the same salinity and pressure. One cools while the other does not. What tendency fits ordinary seawater conditions?
Keep this idea: Wind drives much surface circulation; temperature and salinity help influence water density and deeper movement.
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Source material checked 2026-10-28. Explanations and activities by Nepedia. Source links do not imply endorsement.
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