refractivity

例句：

1. 1. The physicist used a prism to measurethe refractivity of the gas.
   物理学家使用棱镜来测量气体的折射率。
2. 2. The scientist discovered that the refractivity of water increases with temperature.
   科学家发现水的折射率随着温度的增加而增加。
3. 3.The engineer calculated the refractivity ofthe medium using the formula for light propagation.
   工程师使用光传播公式计算了介质的折射率。