This factor accounts for the gas adsorbed on the solids and its holdback in the system.

The sawdust and adsorbed carbon hydrogen was used to produce methane through anaerobic fermentation system. The original sawdust and used sawdust rich in organics were experimented.

In the projector use of the environment is very important in the dust, smoking must be prohibited, because of dust particles more easily adsorbed on the optical system.