These measurements are often made with a CTD instrument, where the instrument is placed in the ocean water from a ship or a platform. You just need to measure the salinity, temperature and pressure to be able to find density. Density is usually calculated using an equation. If you wanted to measure the density of ocean water, you would have to collect a sample of sea water and bring it back to the laboratory to be measured. The density of ocean water is rarely measured directly. That is, water moves along the layers with the same density. Circulation in the depths of the ocean is horizontal. The deep ocean is layered with the densest water on bottom and the lightest water on top. A new formulation of the density of air- saturated water as a function of temper- ature on tlie 1990 International. So, the density of ocean water increases and increases as you go to the bottom of the ocean. The temperature of the ocean decreases and decreases as you go to the bottom of the ocean. So a layer of water with higher salinity can actual float on top of water with lower salinity if the layer with higher salinity is quite a bit warmer than the lower salinity layer. There is one catch though! Temperature has a greater effect on the density of water than salinity does. Given two layers of water with the same salinity, the warmer water will float on top of the colder water. That is, the density will increase with depth to 1000 kg m3, and the deep water will. Less dense water floats on top of more dense water. As the surface water is being cooled the lake will become stratified. Increasing salinity also increases the density of sea water. So, the colder the water, the more dense it is. Ocean water gets more dense as temperature goes down. There are two main factors that make ocean water more or less dense than about 1027 kg/m 3: the temperature of the water and the salinity of the water. Density of ocean water at the sea surface is about 1027 kg/m 3. Ocean water is more dense because of the salt in it. The density of pure water is 1000 kg/m 3. maximum density (at 3.98 C) 1.0000 grams per cubic centimetre. A fun activity dealing with the density of salt water versus fresh water
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