Physically it is impossible to have complete thermal insulation between two media. 從物理學上講，兩種介質之間不可能有完全的絕熱。
The thermal damping is maximum for frequencies corresponding to pulsations that are somewhere between isothermal and adiabatic. 當脈動處於等溫和絕熱之間某個狀態時，相應頻率下的熱阻尼是最大的。
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