热力学是物理学的一个分支,是物理学中研究能量的学科,研究能量转换的原则,转换的形式,转换的条件和转换的限度。由于热力学发展的起始就和化学结合在一起,成为研究元素化学性质、化学反应和化学变化的重要理论基础。因此热力学又是物理化学的主要内容。 Thermodynamics is a branch of physics. It is a subject that studies energy in physics. It studies the principles of energy transformation, the forms of transformation, the conditions of transformation and the limits of transformation. Since the beginning of thermodynamic development is combined with chemistry, it becomes an important theoretical basis for studying elemental chemical properties, chemical reactions and chemical changes. Therefore, thermodynamics is the main content of physical chemistry.