What is energy? What is Energy?

Say energy is a wave? So why is there such a saying that "waves have energy"? Personally, I believe that waves and particles are the two extreme models of the form of matter, and both are for the form of matter.

Energy, which can be thought of as a state of being. From this point of view, energy is the conceptual bridge between "information" and "matter". That is, information is expressed as energy through matter.

Here's an example. Two particles, which are substances, have gravitational potential energy because they have, say, a distance of 5 meters. This "they have a distance of five meters" is the "information" that eliminates the uncertainty of their existence, and because they have a definite form of existence, they have a definite energy (gravitational potential energy).

As another example, a particle moves at a speed of 10 meters per second relative to the observer. This particle is "matter", and it is moving at a certain speed (10 m s) relative to the observer, so it has a certain kinetic energy relative to the observer.

Various forms of energy can be equally understood. In summary, energy is the state that matter has because of its existence, and if its existence has information, energy also has corresponding certainty.

It can be thought of as a kind of wave.

In his later years, Einstein devoted himself to the research of the "unified field theory", which believed that the universe is formed by the interaction of energy fields, regardless of the electric field, magnetic field, gravitational field, etc., the essence is the same, but the way of expression is different. That is to say, whether electrical energy, thermal energy, mechanical energy, nuclear energy, etc., the essence is the same, and its basic transmission form is the wave form.

However, some scientists have expressed skepticism about this, and it seems that there is no public opinion yet.

Truth be told, no one really understands this question

Energy is a physical quantity that characterizes the state of matter, not matter, not waves or particles, and cannot be converted into matter.

Although energy cannot be seen or touched, its role cannot be underestimated! It is no exaggeration to say that all aspects of life activities need energy, and energy is to maintain various physiological functions and life activities of the body.

The human body obtains energy that can sustain various life activities inside and outside the body by ingesting animal and plant foods and digesting and decomposing these three major nutrients. In addition, dietary fiber, ethanol, organic acids, and sugar alcohols can also provide a certain amount of energy for the body. We usually convert the amount of energy produced by energy capacity nutrients as follows:

Carbohydrates 4 kcal g, fat 9 kcal g, protein 4 kcal g.

The energy of food depends on its nutritional composition, and the higher the energy conversion of fatty foods, such as fatty meat is higher than lean meat, and fried foods have a high fat content, so the energy converted is also relatively high. Vegetables and fruits contain more fiber and water, while lower in fat and protein, so they contain less energy.

Energy is a measure of the degree to which the spatial and temporal distribution of matter may change, and is used to characterize the ability of a physical system to do work. Modern physics has clarified the quantitative relationship between mass and energy, that is, Einstein's mass-energy relation: e=mc2.

The unit of energy is the same as the unit of work and is joules (j) in the International System of Units. In the fields of atomic physics, nuclear physics, particle physics, etc., electron volts (EV) are commonly used as a unit, 1 electron volt = , 18 10 19 joules. In the field of physics, erg (erg) is also used as a unit of energy, 1 erg = 10 7 joules.

Energy is a measure of the degree to which the spatial and temporal distribution of mass may change, and is used to characterize the ability of a physical system to do work. ”

Meaning of energy:1. The physical quantity that represents the functional force of an object can be divided into kinetic energy, potential energy, thermal energy, electrical energy, light energy, chemical energy, nuclear energy, etc. One form of energy can be converted into another.

The unit is joules. Abbreviated as can.

2. The activity ability shown by the metaphor of people: don't look at the fact that there are not many people, but it is not small.

Pinyin: [ néng liàng ].

Cited explanation: Yang Xu, "Prosecutor Tang Tietou": "However, Tang Jianzhou greatly underestimated the energy of this little poisonous snake. ”

Synonyms of energy:1. Strength. [ lì liàng ]

1. Strength: how big a person is. Don't look at him small, he's not small.

2. Ability: Do everything to complete the task.

3. Function; Potency: This pesticide is great.

2. Strength. [ lì qi ]

the effectiveness of the muscles; Strength: He is big, and he lifted this big stone alone. I was so tired that I couldn't even speak.

Lu Xun "Wild Grass Kite": "In terms of growth and strength, he is no match for me." ”

Energy is a measure of how much the spatial and temporal distribution of mass is likely to change.

Energy exists in many different forms. According to the classification of different forms of motion of matter, energy can be divided into nuclear energy, mechanical energy, chemical energy, internal energy (thermal energy), electrical energy, radiation energy, light energy, biological energy, etc. These different forms of energy can be converted into each other through physical effects or chemical reactions.

Various fields also possess energy.

Everything in the world is in constant motion, and among all the attributes of matter, motion is the most basic attribute, and all other attributes are the concrete manifestations of motion. Energy is a measure that characterizes the ability of a physical system to do work.

In nutrition, energy refers to the chemical energy (biomass energy) contained in food that can be absorbed by the human body, and the energy in food can sometimes be called heat.

Energyform

1. Chemical energy.

Chemical energy is the energy released or absorbed when a substance undergoes a chemical change (chemical reaction). For example, the discharge of dry batteries and accumulators is the conversion of chemical energy into electrical energy; Charging a battery converts electrical energy into chemical energy. Its essence is the energy released by the change of electrons in the outer shell of the atom, which leads to the change of electron binding energy.

The annihilation of electrons and negative electrons into photons is the energy of the electrons' static energy converted into photons.

2. Internal energy (thermal energy).

The sum of the kinetic energy of the thermal motion of the atoms and molecules inside the substance and the potential energy between the atoms, the higher the temperature, the greater the internal energy (thermal energy) contained in the substance. The thermal wide liquid machine is the expansion of water vapor, which turns its internal energy (thermal energy) into the kinetic energy of the heat engine.

3. Electric energy. The electric potential energy between the positive and negative charges due to the action of electricity can be expressed by the strength of the electric field. The electrical energy density in a vacuum (electrical energy per unit volume) is the electric field energy density w=e2 2;The electrical energy density in the medium w=e·d 2, where d is the displacement vector and e is the electric field strength.