hi, my question is about thermodynamics, and i\'m a mech. eng. student. here is

Question

hi, my question is about thermodynamics, and i'm a mech. eng. student. here is the question. we know the first law of thermodynamics says energy is conserved. and we have the equation: E[in] - E[out] = E[system]. here E[in] and E[out] are work done or heat transferred to system. but we can make this E[system] equal to internal energy of enthalpy change. and i have trouble with that because i don't know when should i go for internal energy or enthalpy? Can you tell me when and why should i use internal energy = E[system]?

Explanation / Answer

Internal energy = enthalpy only when the process is an isobaric one, that is the pressure remains constant throughout the process.

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