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On the assumption that the product of volume thermal expansivity and bulk modulus based on the thermodynamic approximation theory, a new equation is presented for volume thermal expansion coefficient. 根據(jù)熱力學近似理論，在對體積熱膨脹系數(shù)和體積彈性模量的乘積進行假設的基礎上推導了一個體積熱膨脹系數(shù)與體積和溫度間的關系式。