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Explosion pressures

Explosion pressures

Explosion pressures

(OP)
A non-electrical question for electrical engineers (we seem to know something about everything).

Anyone know where I can get a chart (on the web preferably) showing differences in pressure expected when igniting ethylene at different ambient pressures?  That is, if in a certain container we measure a peak pressure of 100 psi during the burn when the unignited mixture was at 1 atmosphere, what will the pressure be if ambient is 1.1 atm, or 1.2, etc.?

This does have an electrical background: it's related to the test of electrical equipment for a Group IIB hazardous area.

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