ATOC 182 Lecture 19: ATOC 182 Day 19 - Salinity and sea water
1 May 2016
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Document Summary
Density is a function of temperature, pressure, and salinity. More salt ions make the water denser (heavier) The change in density in respect to these factors are displayed in a t-s plot of density. In fresh water highest density happens at 4 degrees bellow that water becomes less dense. Diffusion: molecules diffuse according to random molecular motion, they move around and bump into each other in a random fashion. Temperature - heat can diffuse without individual molecules having to travel very far, so it diffuses relatively faster than salinity does, that being said diffusion for both is pretty slow when there isnt any external forces helping the diffusion. When cold fresh water is brought into salty hot water, the cold fresh water will become warm fast and therefore will because less dense then the surrounding water making it move to the surface.
