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基于热力学原理，油松比允许范围为－１≤σ≤０．５。虽然具有负泊松比的物质在理论上是存在的，但是除密度泡沫材料外，具有负泊松比的物质没有被发现．当岩石纵波速度与横波速度之比＜，则泊松比为负值。它揭示了岩石破碎的深层次问题，促使人们对能引导宏观观察负油松比效应的微观结构去探索，即从矿物、岩石的微观结构去探讨岩石破碎问题。这对深部地质钻探和深部地质理论也是一项必须探索的课题。
Based on the thermodynamic principle, the allowable range of oil to pine ratio is -1≤σ≤0.5. Although materials with a negative Poisson’s ratio are theoretically present, substances with a negative Poisson’s ratio, except for density foam, are not found. When the ratio of P-wave velocity to S-wave velocity, the Poisson’s ratio is negative. It reveals the deep-seated problems of rock fragmentation, prompting exploration into microscopic structures that can lead to a macro-observation of the negative oil-to-pine effect, ie from the microscopic structure of minerals and rocks to explore rock fragmentation. This is also a topic that must be explored for deep geological drilling and deep geological theory.