关键词: 密度, 晶体结构, 化学键性质, 地球物质的密度, 行星及恒星的密度

Abstract: Material density is relative to species of elements and their atomic arrangement. Solid material density lies on crystal structure and chemical bonding properties. It is illustrated that the state of density in the Earth’s interior layers and the result of their distinctness. As the depth increases, temperature and pressure will increase, the composition of metallic bond and covalent bond will increase. The density distinctness of celestial bodies is discussed. The research of the state of temperature and pressure in the Earth’s layers will conducive to the exploiture and improvement of synthetic materials.

Key words: density, crystal structure, chemical bonding properties, density of Earth’s materials, the densities of planet and fixed star