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A flame (from Latin flamma) is the visible, gaseous part of a fire. It is caused by a highly exothermic chemical reaction made in a thin zone. [1] When flames are hot enough to have ionized gaseous components of sufficient density, they are then considered plasma. [vague] [2]
The closest will be the hottest part of a flame, where the combustion reaction is most efficient. This also assumes complete combustion (e.g. perfectly balanced, non-smoky, usually bluish flame). Several values in the table significantly disagree with the literature [ 1 ] or predictions by online calculators.
The flame is the visible portion of the fire. Flames consist primarily of carbon dioxide, water vapor, oxygen and nitrogen. If hot enough, the gases may become ionized to produce plasma. [2] Depending on the substances alight, and any impurities outside, the color of the flame and the fire's intensity will be different. [3]
A typical temperature increase upon ignition of a cool flame is a few tens of degrees Celsius whereas it is on the order of 1,000 °C (1,830 °F) for a hot flame. [2] [13] Most experimental data can be explained by the model which considers cool flame just as a slow chemical reaction where the rate of heat generation is higher than the heat loss.
The yellow flame is considered "dirty" because it leaves a layer of carbon on whatever it is heating. When the burner is regulated to produce a hot, blue flame, it can be nearly invisible against some backgrounds. The hottest part of the flame is the tip of the inner flame, while the coolest is the whole inner flame.
The 'flame' that will remain lit during the duration of the 2024 Games is actually a mixture of ... The cauldron — which forms the base of a spherical hot-air balloon — then lifted into the ...
c. 1670 K at blue candle flame; 1811 K, melting point of iron (lower for steel) 1830 K in Bunsen burner flame; 1900 K at the Space Shuttle orbiter hull in 8 km/s dive; 2022 K, boiling point of lead; 2074 K, surface temperature of the coolest star, 2MASS J0523-1403; 2230 K, Debye temperature of carbon; 2320 K at open hydrogen flame
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