conservation of energy law meaning in Chinese

能量守恒定律

Thermodynamics the first laws are conservations of energy law , say namely the energy simplely being able to not create something out of nothing , also unable intangible disappear , the energy can change from one kind of form being that another kind of form , the general energy are invariable in nature
热力学第二定律是描述热量的传递方向的：分子有规则运动的机械能可以完全转化为分子无规则运动的热能；热能却不能完全转化为机械能。