Material volatile diverse water
The volatility of water in diverse charcoal includes all such waste liquids and tar that were not completely removed during the process carbonizaci6n. When the carbonizaci6n is prolonged and high temperature, the volatile content is then low. When the temperature is low and carbonizaci6n the period when the furnace is short, then the content of volatile substance increases.

These effects are reflected in the yield on charcoal made from a given weight of wood. At low temperatures (300 ° C) is possible in coal output of almost 50%, with temperatures of 500-600 ° C carbonizaci6n the volatile are scarce and are typical yields of 30% in the coal. With very high temperatures (around 1,000 ° C) the volatile content is almost zero and the yield falls to around 2%. As mentioned above, charcoal can absorb the tar and acid washing pirolenosos with rain in the methods of burning pit or similar. Therefore, the charcoal can be either burned but thus have a high content of volatile substance. This results in a variation in additional coal burned in pits, in humid climates. The acids are reabsorbed that coal becomes corrosive, causing rot jute bags, which is a problem during transport, and also not have a clean burning.

The volatile substance in charcoal can vary from a ceiling of 40% or more, up to 5% or less. Its measurement is made by heating a sample, by weight of coal and dry air away, or up to 900 ° constant weight. The weight loss is the volatile substance, which is specified, usually as free moisture content, or volatile substance - humidity (SV - humidity).

The charcoal very volatile matter turns on easily but by burning produces smoke. The few volatile coal is struggling to ignite and its combustion is very clean. A good charcoal trade can have a content of volatile substance net (free of moisture) of 30%. The coal very volatile substance is less brittle than coal combustion strong common with little volatile # so it produces less fine charcoal during transport and handling. It is also more hygroscopic and therefore has a greater moisture content naturally.