There are two ways to change the internal energy of an object: doing work and heat transfer, which is equivalent to changing the internal energy of an object.
5. When an object does external work, the internal energy of the object decreases;
When the outside does work on an object, the internal energy of the object increases.
6. The object absorbs heat, and the internal energy of the object increases as the temperature rises; An object gives off heat. When the temperature decreases, the internal energy of the object decreases.
7. The unit of all energy is joule.
8. Heat (Q): In the process of heat transfer, the amount of energy transferred is called heat. It is wrong to say how much heat an object contains.
9. Specific heat (C): The heat absorbed (or released) when the temperature of a substance per unit mass increases (or decreases) by 65438 0℃ is called the specific heat of the substance.
10. Specific heat is an attribute of matter, which does not change with the change of volume, mass, shape, position and temperature of matter. As long as the matter is the same, the specific heat is the same.
1 1. The unit of specific heat is Joule/(kg℃), pronounced Joule per kg℃.
12. The specific heat of water is: C=4.2× 103 Joule/(kg℃), which means that every time the temperature increases (or decreases) 1℃, the heat absorbed (or released) per kg of water is 4.2× 1000.
13. Calculation of heat:
(1) q absorption =cm(t-t0)=cm△t liter (q absorption is the heat absorbed in joules; C is the specific heat of the object, and the unit is: coke/(kg℃); M is mass; T0 is the initial temperature; T is the late temperature.
② Q amplification =cm(t0-t)=cm△t decrease.
I hope I can help you.