Search results
Results From The WOW.Com Content Network
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]
Ignition temperatures; Natural gas: 4.7 15 482-632 °C Propane: 2.15 9.6 493-604 °C Butane: 1.9 8.5 482-538 °C Acetylene: 2.5 81 305 °C Hydrogen: 4 75 500 °C
The flash point of a material is the "lowest liquid temperature at which, under certain standardized conditions, a liquid gives off vapours in a quantity such as to be capable of forming an ignitable vapour/air mixture". [1] The flash point is sometimes confused with the autoignition temperature, the temperature that causes spontaneous ignition.
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 ...
[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]
It is measured as a unit of energy per unit mass or volume of substance. The HHV is determined by bringing all the products of combustion back to the original pre-combustion temperature, including condensing any vapor produced. Such measurements often use a standard temperature of 25 °C (77 °F; 298 K) [citation needed].
The maximum temperature of about 2,800 °C (5,100 °F) is achieved with an exact stoichiometric mixture, about 700 °C (1,300 °F) hotter than a hydrogen flame in air. [ 7 ] [ 8 ] [ 9 ] When either of the gases are mixed in excess of this ratio, or when mixed with an inert gas like nitrogen, the heat must spread throughout a greater quantity of ...
The auto ignition point of blast furnace gas is approximate 630–650 °C (1,166–1,202 °F) and it has a lower explosive limit (LEL) of 27% and an upper explosive limit (UEL) of 75% in an air-gas mixture at normal temperature and pressure. The high concentration of carbon monoxide makes the gas hazardous.