number density的用法和樣例：
例句
- The incompressibility of the fluid is determined by introduction of a so-called particle density number.
流體的不可壓縮性是通過引人粒子數密度概念實現的。 - In strong magnetic fields, Proton density increases with the increasing of total baryon densities, while neutron number density decreases.
隨著總粒子密度的增加質子粒子數密度增加，中子粒子數密度減小。
