Vaporization of a liquid requires ____ energy input than pyrolysis of a solid fuel.

The vaporization of a liquid requires less energy input compared to the pyrolysis of a solid fuel primarily due to the different processes involved in each phase change.

Vaporization involves transitioning from a liquid state to a gas state. This process absorbs energy in the form of heat to break the intermolecular bonds between liquid molecules, allowing them to disperse as vapor. The energy required for this process is known as the heat of vaporization, which is typically lower than many other energy-intensive processes.

On the other hand, pyrolysis of solid fuel is a thermal decomposition process where solid material breaks down into gaseous products through the application of heat. Pyrolysis involves the breaking of chemical bonds in the solid, which often requires significantly more energy input due to the complexity of the chemical structures and reactions occurring during the process.

Therefore, the comparison highlights that the energy needed for vaporization is less than that required for pyrolysis, making it easier for a liquid to turn into vapor compared to a solid undergoing pyrolysis to yield gaseous products.