Vapour pressure Flashcards

1
Q

what is vapour pressure

A

pressure exerted by a pure substance in a system containing only the vapour and condensed phase of a substance

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2
Q

what are flammability limits

A
  • the limits within which a combustion reaction occurs
    at the upper explosive limit - gas will burn
    at the lower explosive limit - gas ignites and burns
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3
Q

calculating the lower flammabilty limit

A

stoichiometric ratio of fuel : oxygen x 100/21

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4
Q

flash point

A
  • minimum temperature at which vapour produced by a liquid can be ignited momentarily in air
    low flash point = higher vapour temperature
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5
Q

fire point

A

minimum temperature at which the vapour produced by a liquid sustains combustion after ignition in air
- often a few degrees higher than the flash point

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6
Q

Ignition temperature

A

the temperature something will spontaneously ignite (auto ignition)
reflects the Ea

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