Human beings live on the earth, and they are inseparable from energy all the time, and even we eat to replenish energy to our bodies. Heat is a kind of energy, electricity is a kind of energy, and even the wind is also a kind of energy, called wind energy.
What is that energy?Energy is the ability of matter to do work and the power that people can produce to influence the action, and also refers to the ability of people to move. Energy is referred to as energy, which is divided into: mechanical energy, internal energy, electrical energy, chemical energy, atomic energy, etc.
Where does the energy on Earth come from?There are many forms of energy in life, such as the most common electrical energy, electricity can drive all kinds of household appliances, we drive a car, the car has kinetic energy, burn gasoline, gasoline has chemical energy, these energies come from
Corresponding to the various forms of motion of matter, there are also various forms of energy, which can be converted into each other in a certain way. In mechanical motion, it is manifested as the mechanical energy of an object or system as a whole, such as kinetic energy, potential energy, etc. It is the sum of the kinetic energy of the irregular motion of the molecules in the system, the potential energy of the interaction between the molecules, and the energy in the atoms and nuclei, but does not include the mechanical energy of the overall motion of the system. The internal energy of thermal motion (formerly known as thermal energy) is recognized by its mutual conversion with mechanical energy.
Let's take the most common electrical energy as an example to discuss, how does electrical energy come about?Electricity is generated by the conversion of other forms of energy by generators. For example, thermal power generation is the conversion of chemical energy in coal or oil into electrical energy;Wind power generation is the conversion of the mechanical energy movement of the wind into electrical energy;Hydroelectric power is the conversion of the gravitational potential energy of water into electrical energy.
How is energy converted?Coal and oil are buried in the ground for several years, formed by geothermal pressure and bacterial decomposition, they are actually stored solar energy, and coal and oil are burned to generate electricity. Bioenergy comes from ** again?Animals eat plants, and plants absorb solar energy, which is photosynthesis. Wind power generation, the wind is generated because of the pressure difference and the temperature difference, therefore, the energy of the wind is converted by the internal energy generated by the temperature difference, the temperature difference in each place is different because of the different sunlight irradiation, and the internal energy is the conversion of solar energy to the earth through radiation. Where does the gravity of water come from?Water is the evaporation that allows steam to rise to high altitude, and evaporation requires heat absorption, so water is the gravitational potential energy that converts internal energy into water, which is used to generate electricity.
The electricity generated by thermal power generation, wind power generation, and hydropower generation is all the best in solar energy. Why is it too ** energetic?Because there is nuclear fusion inside the sun, the nuclear energy inside the sun is converted into solar energy through fusion. It can be seen that most of the electrical energy we use is the same, that is, the nuclear fusion of solar energy. Today's nuclear energy is modeled after the sun's energy generation model, nuclear fusion.
We have biological energy when we move our bodies, so where does the energy come from?Human energy** is compared to food, and after eating, it absorbs the bioenergy in the food, and the food converts solar energy into bioenergy through photosynthesis. Plants on Earth use the energy of sunlight to make starch with water and carbon dioxide. This photosynthesis is the most important chemical reaction on Earth because it produces the food that all living things on Earth depend on for survival. Therefore, human energy is also the best than the nuclear fusion of solar energy.
In addition to the vast majority of the energy on the earth is the sun, there is also energy on the earth and the moon. **The energy of the earth is geothermal energy, such as hot springs, and the energy of geothermal energy is derived from the magma inside the earthThe second is the earth's nuclear energy, such as nuclear power plants, which use uranium-235 as a material to produce nuclear energy, which is not the sun, which is the energy of the earth itself. Another energy** is the moon, like the tides, which are divided into solar tides and moon tides. But the moon tides are much larger than the sun tides, and we generally say that the tides are caused by the moon. Electricity can also be generated using tides, such as tidal power.
All this energy is given by the sun, and the energy generated by the light and heat emitted by the sun sends us warmth and light, and is an indispensable source of life for all things living on earth. Although this energy is only a small part of the energy emitted by the sun, it is enough for the earth to use. Most of all the energy on Earth, except for the heat energy in the ground, is provided by the sun.
Of course, we don't need to think too much about "energy". Hundreds of years ago, when people first put forward the concept of "energy", they said that "the ability of matter to do external work due to its movement is energy", which is the definition of "energy". Energy is the ability to do work, provided that "the movement of matter". In other words, the existence of energy means the existence of "moving matter", and energy and matter are always together and inseparable;Because matter is in general motion, moving matter generally has energy, that is, "energy is a universal property of matter". In the early days, when people faced the macrocosm, the movement of macroscopic objects was obvious, and the understanding of "energy" was also easy;Nowadays, it is more difficult to face the microcosm, or even the "supermicrocosm". But the essence remains the same, in the microcosm and the supermicrocosm, energy is still a universal property of matter, but the matter here is "microcosm" and "supercosm".
Our eyes cannot see microscopic matter, and it is difficult for us to see ultra-microscopic matter with our existing technical means, but we can know the work it does through "force", that is, the existence of energy. Gravitational and electromagnetic forces come from the air, so those subtle matter moves in the air, and there is energy in space. We are alive, we are material, we are in motion, we have energy;When we die, life stops, matter is dispersed, but the matter is still in motion, and the matter still has energy. That is, as long as matter exists, movement does not stop, and energy exists. In short, energy is matter in motion;Where there is matter, there is energy;Where there is energy, there must be matter. Energy cannot exist in a vacuum, there is no such thing as "pure energy" without matter.
There is a saying that the extinction of the dinosaurs was caused by a comet hitting the earth, or a volcanic eruption, causing a large amount of dust to cover the earth, and the sunlight could not shine, resulting in the inability to photosynthesize, so that all life ended, of course, the stronger vitality continued, and evolution began again.
The Earth is now about 5 billion years old, and scientists believe that the Earth will last forever if it is not disturbed by any external factors. However, the Earth cannot escape the interference of other celestial bodies in the universe, and there is a day of birth and a day of death. The celestial body that has the greatest impact on the earth is the sun, so to speak, all the energy on the earth comes from the sun, and if the sun dies, then the earth will be destroyed.