As a fire science expert, I have spent considerable time studying the various aspects of fire, including its colors and temperatures. Fire is a fascinating phenomenon that has been a subject of human fascination and necessity for thousands of years. One of the most intriguing aspects of fire is its color, which is directly related to its temperature.

The color of fire can range from a pale blue to a deep red, and each color represents a different temperature. The coldest color of fire is typically considered to be a dark red or reddish-orange. This is because the color of a flame is a result of the blackbody radiation emitted by the soot particles within the flame. As the temperature of the flame decreases, the wavelength of the light emitted shifts towards the longer, red end of the spectrum.

The information you provided states that the inner core of a candle flame is light blue, with a temperature of around 1800 K (1500 °C), which is indeed the hottest part of the flame. As you move away from the center, the flame's color transitions to yellow, orange, and finally red, indicating a decrease in temperature. This is due to the fact that cooler gases are being heated and ionized at the outer edges of the flame, emitting light at longer wavelengths.

However, it's important to note that the color of fire can be influenced by various factors, including the type of fuel, the presence of impurities, and the oxygen supply. For example, a fire fueled by wood or coal will have a different color spectrum compared to a fire fueled by gas. Additionally, the presence of impurities can cause certain colors to dominate, such as the green color seen in some fireworks due to the presence of copper compounds.

Furthermore, the temperature of a flame can be measured using various methods, including the use of pyrometers or by observing the color of the flame and comparing it to a known color-temperature chart. However, it's worth mentioning that the human eye is not a precise instrument for measuring flame temperatures, and the colors we perceive can be subjective.

In conclusion, while the inner core of a flame is the hottest and typically appears light blue, the coldest color of fire is generally a dark red or reddish-orange, which corresponds to the cooler temperatures at the outer edges of the flame. Understanding the relationship between the color and temperature of fire is crucial for fire safety, combustion efficiency, and the study of fire behavior.

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The inner core of the candle flame is light blue, with a temperature of around 1800 K (1500 --C). That is the hottest part of the flame. The color inside the flame becomes yellow, orange, and finally red. The further you get from the center of the flame, the lower the temperature will be.Aug 26, 2011read more >>