define ignition temperature
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Answer:
The autoignition temperature or kindling point of a substance is the lowest temperature at which it spontaneously ignites in 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.
Ignition temperature
In other words it is the minimum temperature at which a combustible substance such as air or gas, must be heated up prior to burning in the absence of any source of the heat.
Definition of ignition temperature. : the lowest temperature at which a combustible substance when heated (as in a bath of molten metal) takes fire in air and continues to burn. — called also autogenous ignition temperature. — compare fire point.
Ignition temperatures are vitally important for process designs as it is the temperature to prevent or eliminate readily available ignition sources, which is specified for some plant equipment, for example, operating temperatures of electrical equipment, lighting fixtures, etc.
Typically, ignition temperatures are measured by placing the substance in a half-litre vessel and inside a temperature-controlled oven. The current standard procedures for such tests are outlined in ASTM E659.
Coal has an ignition temperature of 600 Celsius making it the highest among the given options. Coal is a very important agent that finds its use in almost every sector. It is one of the biggest natural resources that are being used.
Kerosene which is a product of petroleum can catch the fire easily and hence has the lowest ignition temperature.
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