**Internal energy**

The association of energy with random molecules who move in disordered motion is known as internal energy.

**Specific heat**

Every matter has a certain temperature that is related to that mass. The amount of heat that is required to increase the temperature of a mass by one degree Celsius is known as specific heat. The heat amount is calculated on the basis of per unit mass.

**Enthalpy**

A system’s total heat content (equivalent) thermodynamic quantity = enthalpy

As per this, it is the result of the sum of volume and pressure,and a system’s internal energy.

Its equation is depicted as,

H=U+PV

Where,

- PV is pressure and volume
- U is internal energy
- H is enthalpy

**Links of Previous Main Topic:-**

- Open system and control volume
- Conversion of work into heat
- Introduction to carnot cycle
- Clausius inequality entropy and irreversibility introduction
- Ideal gas or perfect gas
- Ideal gas or perfect gas
- Specific heats internal energy and enthalpy of an ideal gas

**Links of Next Mechanical Engineering Topics:-**

- Entropy change of an ideal gas
- Reversible adiabatic process
- P v and t s diagrams for pv c
- Equations of state
- Law of corresponding states
- Introduction about air standard cycles
- Properties of pure substances introduction
- Vapour compression refrigeration cycle introduction
- Basic fluid mechanics and properties of fluids introduction
- Fluid statics introduction
- Manometers measurement pressure