质量守恒定律 自然界的基本定律之一 law of conservation of mass 质量守恒定律一般指物质守恒定律(自然界的基本定律之一) Law of conservation of mass generally refers to the law of conservation of matter (one of the fundamental laws of nature) 拉瓦锡, 现代化学之父 Lavoisier ...
能量守恒定律(Law of conservation of energy)是自然界普遍的基本定律之一。一般表述为 :能量既不会凭空产生,也不会凭空消失,它只会从一种形式转化为另一种形式,或者从一个物体转移到其它物体,而 能量 的总量保持不变。也可以表述为:一个系统的总能量的改变只能等于传入或者传出该系统的能量的多少。总能量 ...
法线( normal line ) ,是指始终垂直于某平面的直线。在几何学中,法线指平面上垂直于曲线在某点的切线的一条线。法线也应用于光学的平面镜反射上。 normal normal: Latin norma originally denoted a sort of set square used by carpenters, masons, et ...
Heinrich Hertz 参考链接 https://www.britannica.com/biography/Heinrich-Hertz Heinrich Hertz , in full Heinrich Rudolf Hertz , (born February 22, 1857, Hamburg —died January 1, 1894, Bonn , Germany), German physicist who showed that Scottish physicist& ...
图1. Aristotle (384-322 B.C.E.) 图2 图3a 图3b Aristotle: Motion Aristotle’s account of motion and its place in nature can be found in the Physics . By motion, Aristotle (384-322 B.C.E.)understands any kind of change. He define ...