Engineering Thermodynamics
An adiabatic process is one in which

No heat enters or leaves the gas
The temperature of the gas changes
All of these
The change in internal energy is equal to the mechanical work done

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Engineering Thermodynamics
The distillation carried out in such a way that the liquid with the lowest boiling point is first evaporated and re-condensed, then the liquid with the next higher boiling point is then evaporated and re-condensed, and so on until all the available liquid fuels are separately recovered in the sequence of their boiling points. Such a process is called

Cracking
Full distillation
Carbonisation
Fractional distillation

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