关于「密度」Densities

发布网友发布时间：2024-07-04 02:02

共1个回答

热心网友时间：2024-07-04 09:26

「密度」Densities是甚么来的？ Denisty
defined mathematically as the ratio of mass to volume
measures how pact a substance is. 为甚么密度高就沈，低就浮? This is a result of Archimedeus Principle. A low density material object immersed in a high density liquid displaces a volume of liquid that weights more than the object itself. That is
the upthrust acting on the low density object is larger than its weight. The object thus floats. [you could refer to any physics textbook for the mathematical derivation of this result]
油的密度不是很高的吗?为甚么水的密度比它还要高? As said above
density measures the pactness of a substance. The pactness is
in fact
depends on how close the molecules in the substance are from each other (i.e. intermolecular separation)
and the mass of each molecules. Water molecules are more closely packed
thus having a higher density.
oil has higher viscosity
not density
密度是形容该物质粒子排列的情况公式：密度=质量/体积油的密度是比水低的，所以油才会浮在水上。
密度白话说法：一间教室挤满100人跟10人， 100人那间密度是大于10人那间，当体积一定时，密度大者，重量愈重，故比密度小（重量轻）者重，就会比他沉... 油密度比水小，故油浮于水上...