Temperature, pressure, equations of state, and transport laws all play an important role in thermofluid problems.
Phase transition and chemical reactions may also be important in a thermofluid context.
It studies and interrelates the macroscopic variables, such as temperature, volume and pressure, which describe physical, thermodynamic systems.
The release of heat can result in the production of light in the form of either glowing or a flame.
Fuels of interest often include organic compounds (especially hydrocarbons) in the gas, liquid or solid phase.