Uses of water: First of all, water is a necessary substance for the normal metabolism of the human body, accounting for about 70% of normal body weight;
Water can regulate the climate. Without water, the climate on earth may not be the same. It is conducive to human survival;
Water is also very important for agriculture, various crops can be irrigated and grow normally;
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In the Industry, light industry, heavy industry, energy industries, etc., all need to use water resources.
Water is needed everywhere in life, such as for cooking, washing, etc.
Water is one of the most common substances on earth. 71% of the earth's surface is covered by water.
It is an important resource for the survival of all life, including inorganic compounds and humans, and it is also the most important component of living organisms.
Although the tenAlthough the water content of the air is low, it constitutes an important component of the air.
Pure water has very low conductivity and is a very weak electrolyte.
Daily water has more obvious conductivity because it contains more anions and cations dissolved in other electrolytes.
Water is a colorless, tasteless and odorless liquid at room temperature.
Water is a substance necessary for the normal metabolism of the human body. Under normal circumstances, the body must excrete approximately 1.5 L of water each day through the skin, internal organs, lungs and kidneys to ensure the elimination of toxins. are removed from the body. Children's bodies contain 80% water, older people's bodies contain 50-60%, and normal middle-aged people's bodies contain 70% water.
Water is an important component of cell protoplasm. Water plays a transport role in the body and can provide nutrients, decmetabolic hets and endocrine substances (such as hormones).
Water is one of the most common substances on earth and is called “the source of human life”.
With the rapid development of industry, our drinking water sources and surface water have been polluted to varying degrees, and water resources are scarce.
For the survival and development of humanity, we must protect water resources, vigorously advocate water conservation, and educate people about water conservation.
Thermal power plant: Fuel is burned in the boiler and water is heated to steam at high temperature and high pressure. The steam reaches the steam turbine to push its blades to rotate. causes the generator to rotate. The generator rotor windings generate a rotating magnetic field and the stator windings intersecting the magnetic field lines emit an alternating current.
Nuclear power plant: The principle of electricity production is not much different from that of a thermal power plant, except that the fuel used is different, which is nuclear fuel. The nuclear fuel in the nuclear reactor is used as the primary energy to heat water vapor, and the subsequent process is the same as that of thermal energy. Of course, there are many safety safeguards for nuclear power.
Hydroelectric power plant: Typically, a dam is built and a hydroelectric generator is installed in a factory building inside the dam. The pressure difference between upstream and downstream of the dam is used to convert the potential. The rotation also drives the generator to produce electricity (the latter principle is the same as thermal energy).
Pumped storage: This is a hydroelectric plant, but thedifference with ordinary hydropower plants is that ordinary hydropower plants generate electricity in one direction, while pumped storage generates electricity in addition to generating electricity. Electricity is the same as hydropower ordinary, but it also has the capacity to “consume” and store electricity when the electricity consumption of the network is low. Pumped storage power plants typically have two adjacent dams, or two reservoirs relatively close to each other, and their water levels are quite different. They are called upper basin (high water level) and lower basin (low water level). Its hydraulic turbine is different from those used in ordinary hydroelectric power plants: it can generate electricity and can be reversed and used as a water pump. During electricity production, water flows from the upper basin to the lower basinsuperior. When storing energy, the turbine is used as a water pump, consuming the abundant electricity on the grid and pumping water from the lower basin to the upper basin, which is equivalent. to transform electrical energy into water. The potential energy will be used to produce electricity in case of future need (peak network period).