内能,是与分子热运动有关的能量.从微观上说,内能是系统内所有分子无规则运动的动能、分子间相互作用的势能、分子内部以及原子核内部各种形式能量(一般不变)的总和,可想而知内能与分子动能和分子势能、质量(质量大分子多)都有关系.分子一直处于永不停息的无规则运动中,所以分子有动能.分子与分子之间也有相互作用力,分子间也 Internal energy is the energy related to the molecular thermal movement. From the microscopic point of view, the internal energy is the kinetic energy of random movement of all molecules in the system, the potential energy of the interaction between molecules, various forms of energy inside the molecule and inside the nucleus ) Can be imagined that the internal energy and molecular kinetic energy and molecular potential energy, mass (mass of large molecules) are related to the molecule has been in a never-ending random movement, so the molecules have kinetic energy molecules and molecules also have Interactions between molecules also