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2021-05-16

How do oceanographers use their measurements of the conductivity of seawater?

How do oceanographers use their measurements of the conductivity of seawater?

Oceanographers can measure the salinity of a body of water in several ways, but the two most common methods are using a hydrometer set or a salinometer. Oceanographers can also use a salinometer to determine salinity by measuring electrical conductivity, but the instrument is not very accurate.

How do Oceanographers measure the density of ocean water?

Oceanographers measure the density of ocean water by taking a sample of sea water out of the ocean and taking it to the laboratory to be measured…

How do oceanographers convert measurements from a CTD into a value for seawater density?

How do oceanographers convert measurements from a CTD into a value for seawater density? Since the change in density is so small, they just use the last parts of the number.

How do scientists measure the salinity of ocean water?

Ocean water has a salinity that is approximately 35,000 ppm. Instead psu (practical salinity units) are used. Scientists measure salinity by measuring the conductivity of the water as would be measured by a CTD instrument (CTD = conductivity, temperature, depth).

How is density affected when the depth increases?

As you go deeper in depth, pressure increases. Density = mass/volume. The layers beneath us due to pressure get packed to the point of being very dense.

What is the density of water at a depth?

Density of seawater and pressure

depth (m) pressure (decibars) density (g/cm3)
0 0 1.02813
1,000 1,000 1.03285
2,000 2,000 1.03747
4,000 4,000 1.04640

What does the density have to be for an item to float in water?

Students should realize that if an object weighs more than an equal volume of water, it is more dense and will sink, and if it weighs less than an equal volume of water, it is less dense and will float. Remember that the density of water is about 1 g/cm3.

What is density of pure water?

A common unit of measurement for water’s density is gram per milliliter (1 g/ml) or 1 gram per cubic centimeter (1 g/cm3). Actually, the exact density of water is not really 1 g/ml, but rather a bit less (very, very little less), at 0.9998395 g/ml at 4.0° Celsius (39.2° Fahrenheit).

How do you find the density of pure water?

The mass and size of the molecules in a liquid and how closely they are packed together determine the density of the liquid. Just like a solid, the density of a liquid equals the mass of the liquid divided by its volume; D = m/v. The density of water is 1 gram per cubic centimeter.

What is the specific weight of pure water?

The specific weight, also known as the unit weight, is the weight per unit volume of a material. A commonly used value is the specific weight of water on Earth at 4°C, which is 9.807 kN/m3 or 62.43 lbf/ft3. The terms specific gravity, and less often specific weight, are also used for relative density.