Information on some important Terms And Definitions Related To Fire

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(i) Ignition temperature:

The minimum temperature to which a material must be heated in order to initiate or cause self sustained combustion independent of heating element.

(ii) Lower explosion or flammability limit:

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Minimum concentration of vapour in oxygen below which the propagation of flame will not occur in the presence of an ignition source.

(iii) Flammable (explosive) limits:

Mixture of vapour or gas with air which if ignited will just propagate flames.

(iv) Sweating:

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Is a process rescuing human being from heat strokes?

(v) Body burns:

30% of body gets burnt and survival is difficult.

(vi) Fire Severity:

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The condition of the fire which is related to its potential to create maximum temperature & duration of the burning.

Damage caused to material is proportioned to fire severity.

Fire severity depends on.

I. Nature of fire

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Total heat content, rate of burning.

II. Amount of fuel.

III. Arrangement of fuel.

IV. Size & shape of room containing the fire.

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V. Size & shape of the window.

VI. Size & shape of room.

VII. Thermal insulation of walls & ceilings. Specific heat, thermal conductivity, thermal diffusely.

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