Gasification is the broad term used for the conversion of a solid fuel into a gaseous fuel. The process to create heat from solid biomass goes in stages: Wood-gasification turns wood to char and gases. It is controlled by heat input and can be slowed by cooling. Char-gasification turns char to ash and gases. It is controlled by oxygen and can be arrested by deprivation of oxygen. Wood-gas is often used as summarizing term for the mixture of combustible gases and pyrolytic vapors from both gasification reactions. It combusts when mixed with oxygen and ignited. In an open fire, all the stages of gasification and combustion occur simultaneously at the same place and with no or little control over the processes.

Fundamentally, the challenge in cooking is a question of scale; how to gain control over the pyrolysis, gasification and combustion in a small enough (vertical) space to be used by individual households. Micro-gasification refers to gasifiers small enough in size to fit under a cooking pot at a convenient height.

Small-scale micro-gasifiers offer good opportunities for the use in cook stove applications and/or for domestic heating, because they can:

• Cleanly burn the woodgas in mainly smoke-free combustion (unlike conventional burning of solid fuel)
• Provide a steady hot flame shortly after ignition (no waiting, as with charcoal)
• Have high fuel-efficiency due to complete combustion of the fuel (little smoke)
• Be operated batch-fed over extended periods without attention (no tending of fire)  
• Utilize a wide variety of solid biomass fuels, even inexpensive often discarded small biomass residues, that other stoves cannot easily handle (no stick-wood)
  
• Give the user the freedom to decide individually when to use the device, as biomass fuel is often locally available, within reach of most people
• Mixing Efficiency and Analysis
  
• are outstanding in the components of applications and human factors.  in terms of fuel varieties and combustion that is very clean and can be quite easily controlled.
• appropriate uses and sustainable costs
• Heat and power generation
  
• One of the hot potatoes within renewables, is technically and economically viable.