A body of constant heat capacity Cp and Initial temperature T1 is placed in contact with a heat reservoir at temperature T2 and comes to isothermal equilibrium with it. If T2 > T1 what is the entropy change of the universe?
When a system is in equilibrium, any conceivable change in entropy would be
at the peak of the entropy hill.
Match List-I (Laws of thermodynamics) with List-II (Defines) the following:
Consider the processes:
Process A: A heat source at 800 K loses 2000 kJ of heat to sink at 500 K.
Process B: A heat source at 800 K loses 2000 kJ of heat to sink at 750 K.
Which of the following can be concluded?
Thus, total entropy change for the process B is smaller and therefore it is less irreversible.
A piston-cylinder device contains a liquid-vapor mixture of water at 300 K. During a constant- pressure process, 750 kJ of heat is transferred to the water. As a result, part of the liquid in the cylinder vaporizes. What is entropy change of the water during this process?
The system undergoes an internally reversible, isothermal process, and thus its entropy change,
The slope of constant pressure line on a T-s diagram is given by
TdS= dH - VdP
TdS = Cp dT - VdP
TdS - Cp d T - 0
(for constant pressure process)
The slope of constant volume line on a T-s diagram is given by
(for constant volume process)
The value of entropy at 0 K is taken as
S = K ln W
where, S is entropy
K is Boltzmann constant
W is thermodynamic probability
when W = 1, it represents the greatest order,
S = 0. This occurs only at T = 0 K. This is the Nernst-Simon statement of third law of themnodyanamics.
Choose the correct statement:
Which of the following second-law statements is incorrect?