The volume occupied by a unit mass of matter is called a specific volume and is represented by the symbol "V". Its value is the reciprocal of density, ie V = 1 / ρ. Specific volume is used in atmospheric science, and the definition of the position vortex can be used.

1. Seawater specific volume

Seawater density is the mass contained in a unit volume of seawater.

Seawater specific volume refers to the volume occupied by unit mass of seawater, which is numerically the reciprocal of density.

Seawater density varies with temperature and salinity, so various factors affecting temperature and salinity can affect the distribution and variation of seawater density. In the horizontal direction, the ocean surface density increases with increasing latitude, and the iso-density line is approximately parallel to the latitude. Due to the high temperature and low salinity in the equatorial region, the density of the surface seawater is very small, about 1.023. Although the salinity in the subtropical sea area is very high, the temperature is also high, so the density is still small; the polar sea area is very low due to the low temperature. So the density is the biggest. In the vertical direction, the structure of seawater is always stable, the density is increasing downward, and the vertical gradient of density in the ocean is relatively large. Starting from about 1500 meters, the vertical gradient of density is small. In the deep layer, the density hardly changes with depth.

2, hematocrit (Hct, Ht) (specific product / volume)

Hematocrit, also known as hematocrit, refers to the percentage of blood cells in the blood. Normal adult males are 40% to 50%, and females are 37% to 48%. It reflects the relative amount of red blood cells and plasma in the blood. The hematocrit is the volume ratio, the plasma is less, the specific volume is higher, the plasma is more, and the specific volume is reduced. In addition, red blood cell damage increases, the specific volume will also decrease.

Clinical significance:

The clinical significance of hematocrit determination is basically the same as the red blood cell count or hemoglobin measurement is often used as an indicator for the diagnosis and classification of anemia. It can also be used for clinical examination to determine whether patients need rehydration.

Elevated hematocrit is seen in normal people with strenuous exercise or agitation, as well as a variety of patients with dehydration symptoms such as extensive burns.

Reduced hematocrit is seen in various anemia patients in normal pregnant women and in the application of interferon penicillin indomethacin (indomethacin) vitamin A and other drugs

The specific volume is opposite to the density. The density is the mass of the unit volume (solid volume). The unit is Kg/m3, and the specific volume is the volume of the unit mass. The unit is m3/kg.

3. Specific volume of soil (specific volum)

Represents a special volume, which means that when the volume of the solid particles is assumed to be 1, the volume of the void is e, the total volume, that is, the specific volume is equal to the sum of the solid particles and the void volume 1+e

3. Capacitance density (Cp)

Cp refers to the capacitance formed by the unit effective area of ​​the electrode. Its expression is:

Cp=C/S

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