That's its coefficient of volume expansion -- represented by the Greek letter beta.

什么程度的人声膨胀...女演员 带有希腊字母 beta。

The equation for volume expansion just says that the change in volume is equal to the coefficient of volume expansion, times the initial volume, times the change in temperature.

体积膨胀方程只是说体积变化等于体积膨胀系数乘以初始体积再乘以温度变化。