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The autoignition temperature or self-ignition temperature, often called spontaneous ignition temperature or minimum ignition temperature (or shortly ignition temperature) and formerly also known as kindling point, of a substance is the lowest temperature at which it spontaneously ignites in a normal atmosphere without an external source of ignition, such as a flame or spark. [1]
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The degree of flammability in air depends largely upon the volatility of the material - this is related to its composition-specific vapour pressure, which is temperature dependent. The quantity of vapour produced can be enhanced by increasing the surface area of the material forming a mist or dust. Take wood as an example.
Flame temperature Propane in air 1980 °C 3596 °F Butane in air 1970 °C 3578 °F Wood in air (normally not reached in a wood stove) 1980 °C 3596 °F Acetylene in air 2550 °C 4622 °F Methane (natural gas) in air 1950 °C 3542 °F Hydrogen in air 2111 °C 3831 °F Propane with oxygen 2800 °C 5072 °F Acetylene in oxygen
The fire point, or combustion point, of a fuel is the lowest temperature at which the liquid fuel will continue to burn for at least five seconds after ignition by an open flame of standard dimension. [1] At the flash point, a lower temperature, a substance will ignite briefly, but vapour might not be produced at a rate to sustain the fire ...
Minimum ignition energy (mJ) @ proportion in air at which achieved [a] [4] Autoignition temperature Lower Upper Acetaldehyde: 4.0 57.0 IA −39 °C 0.37 175 °C Acetic acid (glacial) 4 19.9 II 39–43 °C 463 °C Acetic anhydride: II 54 °C Acetone: 2.6–3 12.8–13 IB −17 °C 1.15 @ 4.5% 465 °C, 485 °C [5] Acetonitrile: IB 2 °C 524 °C
[7] [8] Many cooking oils have smoke points above standard home cooking temperatures: [9] Pan frying (sauté) on stove top heat: 120 °C (248 °F) Deep frying: 160–180 °C (320–356 °F) Oven baking: Average of 180 °C (356 °F) Smoke point decreases at a different pace in different oils. [10]
The constant volume adiabatic flame temperature is the temperature that results from a complete combustion process that occurs without any work, heat transfer or changes in kinetic or potential energy. Its temperature is higher than in the constant pressure process because no energy is utilized to change the volume of the system (i.e., generate ...