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Physics
»
E.
Thermal Physics
»
E.2.
Laws of Thermodynamics
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Zeroth Law of Thermodynamics (the law of thermal equilibrium)
Overview
Determining the direction of heat flow for two or more objects in contact with each other
The First Law of Thermodynamics
Overview
Solving problems involving the change in internal energy of a system using ΔU = Q – W
The Second Law of Thermodynamics
Overview
Solving problems involving the change in entropy of a system using the equation Î”S = S
_{final}
- S
_{initial}
Solving problems involving the change in entropy of a system using the equation ΔS = (q
_{rev}
) / (T) where q
_{rev}
is the heat added to a reversible process
Recognizing examples of the second law of thermodynamics
Applications of the Laws of Thermodynamics
Solving problems involving the amount of work done by an ideal gas using the equation W = PΔV
Solving problems involving the amount of work done by calculating the area under a P vs. V graph
Solving problems involving the amount of work done by a heat engine using the equation W
_{net}
= Q
_{h}
- Q
_{c}
Measuring the efficiency of a heat engine using the equation eff = 1 – (Q
_{c}
) / (Q
_{h}
)
The Second Law of Thermodynamics — Solving problems involving the change in entropy of a system using the equation ΔS = (q
_{rev}
) / (T) where q
_{rev}
is the heat added to a reversible process
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