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Reactive and flammable gasses become more volatile when put under pressure, as when compressed, leading to more explosive results when ignited. If it is not your intention to ignite the gas for an explosion, it would be best not to heat a compressed (thereby more powerful) gas.

Heat may also increase the volatility of the gas itself and eventually could ignite the gas. For chemically unstable gases, heat can change the chemical composition of the gas itself, which can result in violent reactions, including ignition and explosion.

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