1847, his topic is On the Conservation of Force. After the paper was published, some people believed his theory. The third founder of the law of conservation of energy is the British scientist Joule. 1849 published the topic "On the mechanical equivalence of heat". After the paper was published, it was recognized by many scientists. Later, three different topics were designated as "Law of Conservation of Energy". ?
The law of conservation of energy, the first law of thermodynamics, means that the total energy in a closed (isolated) system remains unchanged. Generally speaking, total energy is no longer just the sum of kinetic energy and potential energy, but the sum of static energy (internal energy), kinetic energy and potential energy.
The law of conservation of energy can be expressed as follows: the change of total energy of a system can only be equal to the amount of energy transmitted into or out of the system. Total energy is the sum of mechanical energy, thermal energy and any form of internal energy except thermal energy.
If a system is in an isolated environment, it is impossible for energy or mass to enter or leave the system. In this case, the law of conservation of energy is expressed as:
"The total energy of the isolated system remains unchanged."
Energy will neither be produced out of thin air, nor will it disappear out of thin air. It will only be transformed from one form to another, or from one object to another, and the total amount of energy will remain unchanged. The law of conservation of energy is one of the basic laws prevailing in nature.
Extended data
(1) Different forms of energy in nature correspond to different forms of motion: the motion of objects has mechanical energy, the motion of molecules has internal energy, the motion of charges has electrical energy, and the motion inside the nucleus has atomic energy.
(2) Different forms of energy can be transformed into each other: "Friction does work by overcoming friction and converts mechanical energy into internal energy to generate heat; When the water in the kettle boils, steam acts on the lid and lifts the lid, indicating that internal energy can be converted into mechanical energy. Electricity can be converted into internal energy through the work of electric heating wires, and so on. " These examples show that different forms of energy can be transformed into each other, and this transformation process is completed by doing work.
(3) Some form of energy reduction will inevitably lead to other forms of energy increase, and the reduction and increase must be equal. When the energy of one object decreases, the energy of other objects must increase, and the decrease and increase must be equal. The premise of the law of conservation of energy is that there is no external interference. )
(4) Energy will neither be generated out of thin air nor disappear out of thin air. It can only be transformed from one form to another, or transferred from one object to another, and its total amount remains unchanged during the transformation or transfer.
References:
Law of Conservation of Energy in Baidu Encyclopedia