Lecture 12

Question 1

Define (again) the points for the First Law of Thermodynamics.

Answer 1

• The First Law is a generalisation of the principle of
  conservation of energy to include heat.

The First Law tells us whether changes of a system are
energetically possible.

It does not tell us whether or not a given change will
occur.

It also does not tell us anything about the efficiency of
conversion of heat into work (or vice versa).

Question 2

Define the Kelvin Statement for the Second Law of Thermodynamics

Answer 2

“No process is possible whose sole result is the complete conversion of heat into work”

Question 3

Define the Clausias Statement for the Second Law of Thermodynamics

Answer 3

“No process is possible whose sole result is the transfer of heat from a colder to a hotter body”.

Question 4

What is true of the entropy in a system if it’s adiabatic?

Answer 4

“Any system has a property called entropy (S) such that
in any adiabatic process ∆S ≥ 0”

Question 5

Define a thermal reservoir.

Answer 5

A thermal reservoir is an object so massive that in taking heat from it or delivering heat to it, its temperature does not change.