A thermodynamic property that measures the degree of disorder or randomness in a system. Entropy increases with increasing disorder. Entropy changes are important in understanding the spontaneity of reactions and phase transitions.

衡量系统无序度或随机性的热力学性质。熵随着无序度的增加而增加。熵变对于理解反应的自发性和相变非常重要。(héng liáng xì tǒng wú xù dù huò suí jī xìng de rè lì xué xìng zhì. shāng suí zhe wú xù dù de zēng jiā ér zēng jiā. shāng biàn duì yú lǐ jiě fǎn yìng de zì fā xìng hé xiàng biàn fēi cháng zhòng yào.)