Flammable liquids burn in presence of an ignition source and are easily ignited by heat, sparks, or flames. Which of the following is NOT a typical ignition method?

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Ignition of flammable liquids requires an energy source that raises the vapor-air mixture to its ignition energy. Heat, sparks, and flames all provide that energy, directly capable of starting combustion. Gravity does not supply ignition energy; it can influence how a spill or vapor moves—causing pooling or spreading—but it cannot ignite the liquid by itself. So gravity is not a typical ignition method.