By analyzing the volume mass-transfer coefficient, the optimal operating flow-ratio and packed density were obtained.

通过考察体积传质系数，确定了纤维液膜萃取分离器的最佳填充密度和最佳流量比。

youdao

Methods thyroid volume (mass) was evaluated by spect volume-integration and by plane image method in 39 experimental thyroid models and in 74 patients with hyperthyroidism, respectively.

方法对39个甲状腺实验模型及74例甲亢患者分别采用SPECT体积积分法及平面成像法估测甲状腺重量。

youdao

You just need a few macroscopic variables that are very familiar to you, like the pressure, the temperature, the volume, the number of moles of each component, the mass of the system.

你只需要某些你非常熟悉的宏观变量,比如压强，温度，体积，每个组分的摩尔数，系统的质量。

麻省理工公开课 - 热力学与动力学课程节选

Ah, but density is mass over volume.

但密度是质量除以体积

耶鲁公开课 - 基础物理课程节选

It is a constant battle for engineers to tweak systems to get them to use up less volume and mass.

FORBES: Why Is Privatized Space Travel A Challenge?

All of these systems take up volume and mass.

FORBES: Why Is Privatized Space Travel A Challenge?

But accurately working out Mathilde's volume (necessary because density is the ratio of mass to volume) was harder.

ECONOMIST: Asteroids