Dynamite is an explosive based on the explosive potential of nitroglycerin, initially using diatomaceous earth or another absorbent substance such as sawdust as an adsorbent. It was invented by Swedish chemist and engineer Alfred Nobel in 1866 in Krümmel and patented in 1867. It is usually sold in the form of a stick 20 centimetres (roughly 8 inches) long and 2.5 centimetres (1 inch) in diameter, but other sizes also exist. Dynamite is considered a high explosive, which means it detonates rather than deflagrates. Trinitrotoluene (TNT) is a chemical compound with the formula C6H2(NO2)3CH3. This yellow-coloured solid is a reagent (reactant) in chemistry but is best known as a useful explosive material with convenient handling properties. The explosive yield of TNT is considered the standard measure of strength of bombs and other explosives.