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Review | Constants Part A One way of expressing the first law of thermodynamics is Which physical law underlies the first law of thermodynamics? AU =Q -W. You need to look at the signs carefully; some conservation of matter sources or disciplines (such as chemistry) may use other signs, which implies different definitions for increase in entropy these quantities. conservation of energy O conservation of work Submit Request Answer Part B According to the first law of thermodynamics mentioned previously, the quantity AU is the change in the of the system. O entropy internal energy O heat temperature Submit Request Answer Part C According to the first law of thermodynamics mentioned previously, the quantity @ is the that is added to the system. O heat work O entropy O mass Submit Request