规定用于测定固体材料粉末密度的标准Rees-Hugill粉末密度瓶的材料、尺寸和结构。所述烧瓶只有一个范围（2.00 g/ml至2.70 g/ml），但密度超出该范围的粉末可通过应用转换系数进行测试。

Specifies the material, dimensions and construction of a standard Rees-Hugill powder density flask, for determining the powder density of solid materials. The flask described has only one range (2.00 g/ml to 2.70 g/ml), but powders with densities outside this range can be tested by applying a conversion factor.