linear thermal expansion

例句：

1. 1.The material expands linearly with temperature.
   这种材料随温度线性膨胀。
2. 2.The linear thermal expansion of the metal is known to be very small.
   金属的线性热膨胀已知非常小。
3. 3. The linear thermal expansion of water is about 0.5 degrees Celsius per degree Kelvin.
   水的线性热膨胀大约是每摄氏度温差0.5度开尔文。