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The calorie is a pre-SI metric unit of energy, approximates the energy needed to increase the temperature of 1 gram of water by 1 °C. Joule (J) - is a derived unit of energy, work, or amount of heat in the International System of Units.

Heat of combustion

 

Fuel type KJ / kg Kcal / kg
Min Max
       
Natural gas 35 600 8 300 9 000
       
Anthracite 30 300 7 000 7 500
Spleen (Half Anthracite) 28 300 6 500 7 000
Poor baking coal 27 400 6 300 6 800
       
Black coal briquettes 25 300 5 900 6 200
       
Long flame coal 22 000 5 000 5 500
       
Lignite briquettes 21 000 4 800 5 200
       
Oak (dry) 20 000 4 700 4 800
       
100%  Birch briquettes 19 400 4 600 4 700
       
Lignite 18 600 4 300 4 600
Ash (dry) 18 200 4 300 4 400
       
Sawdust granules 18 000 4 200 4 400
Sawdust briquettes 18 000 4 200 4 400
       
Birch (dry) 16 500 3 900 4 000
Peat briquettes 15 900 3 700 3 900
Alder (dry) 14 800 3 500 3 600 



Density and heat for dried and freshly sawn wood

Wood Density KJ / kg
humidity : 15 - 20 %
( dried ) 
38 - 42 %
( freshly sawn )
15 - 20 %
( dried 
Oak  ~ 700,0  kg/m³ 15 000 20 000
Ash  ~ 670,0  kg/m³ 13 800 18 200
Birch  ~ 630,0  kg/m³ 12 500 16 500
Alder  ~ 530,0  kg/m³ 11 300 14 800


For comparison :

Piratinera - Snakewood
~ 1 300,0  kg/m³ Heaviest wood  -  sinking in the water
Balsa ~   140,0  kg/m³    Lightest wood  -  lighter than cork tree 
Sequoia h ~ 115 m  The highest tree
Baobab Ø ~  16 m The thickest tree
Christmas tree  9 550 years The longest living tree
Ebony 100.000 $ / m³  Most expensive wood