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Unformatted text preview: Homework 2 (Due in 3.10) 200928005811033  � � Seawater properties 1. What properties of seawater determine its density? Seawater density depends on temperature, salinity and pressure. 2. What is the pressure at the bottom of the ocean relative to sea surface pressure? What unit of pressure is very similar to 1 meter? Pressure increases with increasing depth.The pressure at the bottom of the ocean depends on the mass of water lying above its depth. Relative to sea surface pressure, the pressure change is gravity g = 9.8 m/s2 multiply density and the depth of the ocean. P= gh=1025 kg/m^3*9.8 m/s2*1m ρ ≈ 10^5N/m2=10^5Pascal=1bar, so the unit bar of pressure is very similar to 1 meter. 3. What is the appropriate temperature scale to use for heat content? For heat content , the Kelvin scale for temperature should be used. 4. What happens to the temperature of a parcel of water (or any fluid or gas) when it is compressed adiabatically? What quantity describes the effect of compression on temperature? How does this quantity differ from the measured temperature? (Is it larger or smaller at depth?) When a parcel of water is compressed adiabatically, that is, without exchange of heat, its temperature increases. (This is true of any fluid or gas.) We can use "Potential temperature" to describe the effect of compression on temperature. "Potential temperature" is the temperature which a water parcel has when moved adiabatically to another pressure. Since pressure is lowest at the sea surface, potential temperature (computed at surface pressure) is always smaller than the actual temperature at depth. 5. What are the two effects of adiabatic compression on density? What quantity is used to minimize the effect of compression on density? Colder water is denser. High pressure increases density....
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- Spring '07
- sea water