Thermodynamics.

Conversion of heat to other forms of energy is called thermodynamics.
Systems:

• Open system: Mass and energy can be transferred.
• Close system: Mass cannot be transferred but energy can.
• Isolated system: Mass and energy cannot be transferred.

Boundry:

• Isothermal Boundry: temperature transfer not possible. Heat can transfer.
• Adiabatic Boundry: Heat transfer not possible.

State Functions/ Variables:

Pressure, Volume, temperature, internal energy, entropy.