What is the difference between freshwater and seawater, and the difference between seawater and fres

The sea water is salty, and the fresh water has no salt, just like our tap water.

Seawater contains a high concentration of sodium chloride and other mineral salts, so it tastes very salty, and seawater is denser than freshwater. Since the concentration of salt in seawater is higher than the concentration of human body fluids, drinking it will precipitate the water in the body fluids and cause the human body to lose water, so it cannot be drunk. It is basically the same as freshwater, but the difference is that the freezing point is lower than that of freshwater, and it is slightly more difficult to freeze;

The freezing point is the freezing point of water, i.e. the temperature at which liquid water and solid ice can balance when they coexist. The freezing point of pure water is zero degrees Celsius at 1 atmosphere, and the freezing point of seawater is not only related to pressure, but also related to the salt content of seawater, at the same pressure, the greater the salt content in seawater, the lower the freezing point of seawater; Conversely, the lower the salt content in the seawater, the higher the freezing point of the seawater. There are two types of seawater freezing.

Seawater with a salinity of less than 24 7 because its maximum density value is above the freezing point, after the upper and lower layers of seawater have cooled to the temperature when the maximum density, as long as the surface seawater is cooled to the freezing point, it can freeze. Icing is basically the same as freshwater, except that the freezing point is lower than freshwater, and it is slightly more difficult to freeze; Seawater with a salinity greater than 24 7 is not the same as freshwater, because the temperature of its maximum density value is below the freezing point, the colder the seawater, the heavier it is, although the surface seawater is cooled to the freezing point, then the surface seawater density becomes larger, and it will sink, so it cannot be frozen, only after the upper and lower layers of seawater are cooled to the freezing point, and then continue to cool, the sea surface can be frozen. Another reason is that because the depth of the ocean is generally large, the sea water does not freeze easily.

The ice in the ocean can be broadly divided into floating ice and fixed ice. Floating ice can be divided into two types, one is sea ice formed by freezing seawater, and the other is ice that breaks down on the continent and flows into the sea. The main form of fixed ice is land ice, which freezes together with coastal islands or shallows.

Freshwater does not contain salt, and seawater has salt.

Fresh water is light and sea water is salty.

The sea water is salty and cannot be drunk.

<> difference between seawater and freshwater is mainly reflected in the salinity, density, reserves, generally speaking, freshwater is a water resource that can be directly drunk, but seawater needs to be processed before it can be drunk.

First, the salt content is different:

The salt content in seawater is higher because it contains a high concentration of sodium chloride and other mineral salts, which makes it very salty to drink, while freshwater refers to water with less salt content.

Second, the density is different:

Seawater is denser than freshwater, but the density of seawater is also different, and the deeper you go, the denser the seawater will be. Annihilation trembles.

Third, the amount of reserves is different:

The reserves of freshwater on the earth are far lower than those of seawater, which accounts for only the total amount of water in the world, but the area of the oceans accounts for the total surface area of the earth.

The water we drink in our daily life is all freshwater, but the current freshwater resources are very scarce, and the freshwater in nature comes from solid glaciers, groundwater or natural precipitation.

Especially now, with the continuous improvement of the level of industrialization, water pollution is getting worse day by day, in addition, the uneven distribution of water resources and the low utilization rate of water resources development and utilization have led to the increasingly prominent water use problems.

Therefore, in the end, I suggest that you must save water in your daily life.

Among the types of fish, freshwater fish are common: carp, crucian carp, silver carp, eel, mandarin fish, herring, grass carp, white fish, saury, whitebait, etc.; Marine fish include: yellow croaker (stone needle), pomfret, shark, barracuda, herring, sea catfish, hairtail, cuttlefish, pomfret, flounder, etc.

Fish meat plays an important role in aquatic products.

The fibrous tissue of fish meat is soft, with a water content of about 70% to 80%, and the water loss after conditioning accounts for only 10% 35%, which is less than that of livestock after conditioning. The nutritional content of fish is slightly the same as that of livestock and poultry, and marine fish is an important source of iodine for the human body.

The difference between freshwater and seawater is salinity and **.

Freshwater refers to water with lower salinity, mainly from rainfall, snowmelt, glacial meltwater, groundwater, etc. Fresh water contains relatively few dissolved substances, and the mold matching is mainly due to the collapse of some inorganic salts and organic substances. Seawater, on the other hand, refers to water with a higher salinity, mainly from the sea and the slow exchange between the sea and the land.

Seawater contains relatively many dissolved substances, mainly inorganic salts such as sodium chloride, sodium sulfate, magnesium chloride, potassium chloride and some organic substances.

The concentration of salt in seawater is greater than that of human body fluids, and after drinking, the water in the body fluids will be precipitated and the body will lose water, so it cannot be drunk.

The difference between seawater and freshwater is as follows.

1. The salt content is different.

Seawater contains a high concentration of sodium chloride and other mineral salts, so it tastes very salty.

Freshwater is water with a salt content of less than g l.

2. The density is different.

Seawater has a high salt content and is much denser than freshwater.

3. The amount of reserves is different.

There is a lot of water on the earth, and the reserves of fresh water account for only the total amount of water in the world, and some of them belong to solid glaciers, which are distributed in the high mountains and the north and south poles that are difficult to use, and some of the fresh water is buried deep in the ground, which is difficult to exploit.

A large amount of liquid in the ocean, a precursor to the ocean area of the total surface area of the earth.