EMS 164  Homework 1 Solutions
1. Define in your own words the following terms: enthalpy, entropy, free energy, eutectic. Give
examples of systems composed of one phase and two phases. For the latter, indicate the two
phases (hint: you may consider some microstructures in earlier classes such as E45 and
EMS162)
( 8
Points)
Enthalpy:
(Either of them, 1
Point)
•
A thermodynamic function of a system, equivalent to the sum of the internal energy of
the system plus the product of its volume multiplied by the pressure exerted on it by its
surroundings.
•
Thermodynamic potential of a system, which can be used to calculate the heat transfer
during a quasistatic process taking place in a closed thermodynamic system under
constant pressure.
•
ΔH=E+PV where E is the internal energy of the system
Entropy:
(Either of them, 1 Point)
•
A measure of the disorder or randomness in a closed system.
•
The state function which, when multiplied by a reference temperature, can be understood
as a measure of the amount of energy in a physical system that cannot be used to do
thermodynamic work.
Free energy:
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 Spring '10
 J.Groza
 Thermodynamics, Entropy, Helmholtz free energy

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