<P> Typical ignition energies are: </P> <Ul> <Li> 0.017 mJ for hydrogen, </Li> <Li> 0.2--2 mJ for hydrocarbon vapors, </Li> <Li> 1--50 mJ for fine flammable dust, </Li> <Li> 40--1000 mJ for coarse flammable dust . </Li> </Ul> <Li> 0.017 mJ for hydrogen, </Li> <Li> 0.2--2 mJ for hydrocarbon vapors, </Li>

How do you get a static electric shock