The hottest part of the flame is the base, so this typically burns with a different colour to the outer edges or the rest of the flame body. Blue flames are the hottest, followed by white. After that, yellow, orange and red are the common colours you'll see in most fires.
A red glow is produced when temperatures are about 932°F. Red flames occur at 1112-1832°F and turn orange between 1832-2192°F. At 2192-2552°F the flames turn yellow and if they get hotter the flames become blue-violet.
Thus the colors of light with the highest frequency will have the hottest temperature. From the visible spectrum, we know violet would glow the hottest, and blue glows less hot. As this is true for all forms of light, its application is seen in fire, or when an object is heated up.
Flame colour meaning can be indicative of temperature, type of fuel or the completeness of combustion. For example, a blue flame is the hottest followed by a yellow flame, then orange and red flames.
White: 1300-1500 °C (2400-2700 °F) Blue: 1400-1650 °C (2600-3000 °F) Violet: 39400 °C (71000 °F)
Actual lava is red-orange in color, given its temperature. Truly-blue lava would require temperatures of at least 6,000 °C (10,830 °F), which is much higher than any lava can naturally achieve on the surface of the Earth.
The hottest part of the flame is the base, so this typically burns with a different colour to the outer edges or the rest of the flame body. Blue flames are the hottest, followed by white. After that, yellow, orange and red are the common colours you'll see in most fires.
Blue Flame Means Safe Burning
It is worth periodically inspecting any gas-burning device to check the color of its flame and make sure that it burns blue. This may not be the case for fireplaces, which are often treated with orange or yellow flames to have a more realistic look. There you have it!
The colder part of a diffusion (incomplete combustion) flame will be red, transitioning to orange, yellow, and white as the temperature increases as evidenced by changes in the black-body radiation spectrum. For a given flame's region, the closer to white on this scale, the hotter that section of the flame is.
Fun Fact: Hottest and Coolest Flames
The hottest flame ever produced was at 4990° Celsius. This fire was formed using dicyanoacetylene as fuel and ozone as the oxidizer. Cool fire may also be made. For example, a flame around 120° Celsius may be formed using a regulated air-fuel mixture.
Chemicals and Compounds Can Affect Flame Color
A green flame, for instance, indicates the presence of copper. As copper heats up, it absorbs energy that's manifested in the form of a green flame.
A bunsen burner lets you change the gas and oxygen that mixes together to make it hotter. If you set it up right, you will only see a blue flame which is very, very hot and will melt your metals.
If other chemical elements are present, they may give off their own unique wavelengths of light when burned. For example, the element lithium will produce a pink flame, while the element tungsten will produce a green flame.
Generally, the color of a flame may be red, orange, blue, yellow, or white, and is dominated by blackbody radiation from soot and steam.
Absolutely warm and cool colors can be found at 0 (red – the warmest color) and 180 (cyan – the coolest color) degrees. Determining whether one color is warmer or cooler than another can be measured by their proximities to these poles.
A blue fire would still do just as much damage as red fire. If we are talking about the core of a candle, that is about 1500C which can easily give you a blister. It all depends on how long and how large of an area was burned.
Blue-ish flames have much lower wavelengths (high frequency) with a lot of the light off towards the ultraviolet range, which we also can't see. When a flame glows white, its temperature is somewhere in between those two.
Blue fire can be as hot as 3,000º F. Very flammable materials like natural gas and pure alcohol will typically produce blue flames. The incandescence provided by fire is altered by the increasing heat because of the different wavelengths of light. Azula appears to be the only person capable of creating blue flames.
An atomic bomb detonating is much hotter, like 1111093.33 degrees celcius. (paper burns at around 233 degrees Celsius.)
Dragon fire is hotter, stronger, has better melting abilities, and is presumably magical.
The hottest thing in the Universe (Supernova)
Supernovas are the hottest thing in the Universe as they reach a million degrees Celsius. These explosive events occur when a star between 8 and 40 times more massive than our Sun reaches the end of its stellar lifecycle and explodes when its core collapses.
To commemorate, the duty scientist adjusted the color of lava in the west branch of the Kohola flow to a brilliant green.
Less dense things rise above more dense things, so if you attempt to replicate the actions of the authorities in a particularly egregious 1997 Hollywood movie and build a wall of concrete around a massive lava flow, it won't stop it – the blocks will float on top of it, heat up and begin to melt.
Other examples of metals and ceramics that can withstand lava's temperature include; titanium, iridium, iron alloys, osmium, nickel alloys, aluminum oxide, mullite, and silicon nitride.