Under which weather condition the wildfire more 2 points
likely to spread rapidly and why?
(a) Rain because it decreases the temperature of the burning
substance to attain the ignition temperature
(b) Hot and dry because it increases the temperature of the
burning substance to attain the ignition temperature
(c) Cold temperature
because it does not change the
temperature of the burning substance
(d) High humiditybecause it increases the temperature the
burning substance to attain the ignition temperature
Answers
Answer:
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Answer:
The autoignition temperature or kindling point of a substance is the lowest temperature in which it spontaneously ignites in a normal atmosphere without an external source of ignition, such as a flame or spark. This temperature is required to supply the activation energy needed for combustion. The temperature at which a chemical ignites decreases as the pressure or oxygen concentration increases. It is usually applied to a combustible fuel mixture.
The ignition temperature of a substance is the least temperature at which the substance starts combustion.
Substances which spontaneously ignite in a normal atmosphere at naturally ambient temperatures are termed pyrophoric.
Autoignition temperatures of liquid chemicals are typically measured using a 500-millilitre (18 imp fl oz; 17 US fl oz) flask placed in a temperature-controlled oven in accordance with the procedure described in ASTM E659.[1]
When measured for plastics, autoignition temperature can be also measured under elevated pressure and at 100% oxygen concentration. The resulting value is used as a predictor of viability for high-oxygen service. The main testing standard for this is ASTM G72.[2]