When force, a vector, is combined with another vector that provides orientation, we have the physical quantity called stress, which is an example of a second order tensor.
当力（一个矢量）与另一个提供方向的矢量结合时，我们就有了称为应力的物理量，它是二阶张量的一个例子。
| 单词 | Physical quantities |
| 释义 |
Physical quantities
原声例句
TED-Ed（视频版） When force, a vector, is combined with another vector that provides orientation, we have the physical quantity called stress, which is an example of a second order tensor. 当力（一个矢量）与另一个提供方向的矢量结合时，我们就有了称为应力的物理量，它是二阶张量的一个例子。 就业、利息和货币通论（上） But, since this deduction is not a deduction in terms of money, he is involved in assuming that there can be a change in physical quantity, although there has been no physical change; i.e. he is covertly introducing changes in value. 但是，由于这种推论不是货币形式的推论，他假设物理量可能会发生变化，尽管没有发生物理变化；也就是说，他正在秘密地引入价值的变化。
中文百科
物理量 Physical quantity（重定向自Physical quantities）
物理量，是物理之中能测量的量，例如质量、体积，或者是测量和通常以数和物理单位（通常偏好国际单位制单位）的积表达的结果。 在1971年第十四届国际度量衡大会（General Conference of Weights & Measures）中，选择了七个物理量作为基本量的国际单位系统，其法文名称"Le Système International dunités"，缩写为"SI"，其基本七个物理量如下：
英语百科
Physical quantity 物理量（重定向自Physical quantities）
A physical quantity (or "physical magnitude") is a physical property of a phenomenon, body, or substance, that can be quantified by measurement. A physical quantity can be expressed as the combination of a number – usually a real number – and a unit or combination of units; for example, 1.6749275×10 kg (the mass of the neutron), or 299792458 metres per second (the speed of light). |
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