According to molecular theory ， all matter is made up of small particles called molecules 根据分子理论，一切物质都是由叫做分子的小粒子组成的。
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This thesis mainly expound how to found atomic - molecular theory and einstein ' s theory on brownian movement and perrin ' s experiment on einstein ' s theory 摘要简要介绍了原子分子理论的发展过程、爱因斯坦对于布朗运动的理论研究和佩兰对爱因斯坦布朗运动理论的验证。
