Thermodynamics: Specific Heat Capacity and Enthalpy

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What is Cv related to in thermodynamics?

Changes in external energy

Changes in entropy

Changes in pressure

Changes in internal energy (correct)

What is C related to in thermodynamics?

Changes in volume

Changes in internal energy

Changes in enthalpy (correct)

Changes in entropy

What is the unit of measurement for specific heat capacity?

J/kg.K

kJ/kg.K (correct)

J/kg°C

kJ/kg°C

Is the unit of measurement for specific heat capacity the same in Celsius and Kelvin?

Yes, because they are interchangeable Signup and view all the answers

What is the significance of specific heat capacity in thermodynamics?

It determines the amount of energy required to change the temperature Signup and view all the answers

What is the unit of the term 'ds' in the given equation?

Joules per kilogram kelvin Signup and view all the answers

What is the characteristic of a quasi-equilibrium process?

The system remains nearly in equilibrium at all times Signup and view all the answers

What is the relation between 'P' and 'PdV' in the given equation?

P is proportional to PdV Signup and view all the answers

What is the unit of 'W' in the equation?

Joules per second Signup and view all the answers

What does the equation 'SWF ds = PA ds = PdV' represent?

The energy balance of a system Signup and view all the answers

What is a substance with a fixed chemical composition throughout?

Pure substance Signup and view all the answers

Why is air considered a pure substance despite being a mixture of several gases?

Because it has a fixed chemical composition Signup and view all the answers

What is a saturated vapor?

A vapor that is about to condense Signup and view all the answers

What happens to the temperature of water during the phase-change process between states 1 and 5?

The temperature remains constant at 100°C Signup and view all the answers

What occurs when the entire process between states 1 and 5 is reversed by cooling the water while maintaining the pressure constant?

The water will go back to state 1, retracing the same path Signup and view all the answers

What is true about the amount of heat released during the reversed process?

The amount of heat released exactly matches the amount of heat added Signup and view all the answers

What is the physical significance of the area under the process curve on a P-V diagram for a closed system?

It is equal in magnitude to the work done during a quasi-equilibrium expansion or compression process Signup and view all the answers

What is the mathematical relationship between the area of the process curve and the work done on a closed system?

Area = PdV Signup and view all the answers

What is the condition for a process to occur in a closed system, as depicted on a P-V diagram?

The process must be quasi-equilibrium Signup and view all the answers

Which of the following is a correct unit for the area under the process curve on a P-V diagram?

Joules Signup and view all the answers

What is the relationship between the path 'dA' and the pressure 'P' and volume change 'dV'?

dA = PdV Signup and view all the answers

What is the relationship between internal energy and temperature for an ideal gas?

u is a function of T Signup and view all the answers

What is the expression for enthalpy h in terms of internal energy u and gas constant R?

h = u + RT Signup and view all the answers

What is the relationship between the change in internal energy and the specific heat capacity at constant volume?

du = c₁ dT Signup and view all the answers

What is the relationship between the change in enthalpy and the specific heat capacity?

dh = c dT Signup and view all the answers

What was the purpose of the experimental apparatus used by Joule, as shown in the schematic?

To measure the mechanical equivalent of heat Signup and view all the answers