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某种物质单位体积的质量叫做这种物质的密度.物质的密度是由物质本身决定的物理量.每种物质都有一定的密度.物质的密度跟物体的质量和体积无关.质量为1 kg的某种物质温度每升高(或降低)1℃时所吸收(或放出)的热量叫做这种物质的比热容,简称比热.
The mass of a certain unit volume is called the density of this material. The density of a material is a physical quantity determined by the material itself. Each material has a certain density. The density of a material is independent of the mass and volume of the object. The mass is 1 kg. The amount of heat absorbed (or released) for each increase (or decrease) in the temperature of a certain substance is called the specific heat capacity of the substance, abbreviated as specific heat.