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一、物质的构成常见的物质是由极其微小的粒子——分子、原子构成的.有些物质由分子构成,如水由水分子构成,二氧化碳由二氧化碳分子构成.有些物质由原子直接构成,如铁由铁原子构成等.分子、原子非常小,如果把分子看成小球,那么一般分子的直径大约只有10~(-10)m,用我们的眼睛是无法直接看到分子的,通过放大上亿倍的扫描隧道显微镜可以观察到物体表面的分子.我们所见到的物体中,都含有大量的分子.草叶上的一滴小露珠就
First, the material composition Common material is composed of extremely tiny particles - molecules, atoms, some substances from the molecules, such as water from water molecules, carbon dioxide from carbon dioxide molecules, some substances directly from the atoms, such as iron by Iron atoms, etc. Molecules, atoms are very small, if the molecules as a small ball, then the general molecular diameter of only about 10 ~ (-10) m, with our eyes can not see the molecules directly, by amplifying the billions Times the scanning tunneling microscope can be observed on the surface of the object molecules. We have seen the object contains a large number of molecules.