一、质量和密度的联系与区别1.质量 :物体所含物质的多少叫质量。给定一个确定的物体 ,其质量就确定了。如一段铁丝 ,把其折弯、打扁 ,把其放入油中、放入太空中 ,将它熔化成“铁水”,但含铁多少都不变。可见 ,质量不随物体的形状、位置、状态、温度等条件的改变而改变 ,所以质 First, the quality and density of the connection and difference 1. Quality: The number of substances contained in the object is called quality. Given a certain object, its quality is determined. If it is a piece of wire, bend it, flatten it, put it into oil, put it into space, and melt it into “hot metal,” but the amount of iron will not change. Visible, the quality does not change with the shape, position, state, temperature and other conditions of the object, so the quality