Tyler Brooks
The temperature of a candle flame varies across its different zones, with the hottest part being just above the base, at around 1,400 °C (2,550 °F). The colour of a flame is directly influenced by its temperature, with blue being the hottest, followed by white. The temperature of a candle flame is determined by the type of fuel involved in the combustion, and the oxygen supply, which affects the rate of combustion. The colour of a candle flame can also be influenced by the presence of excitable species with bright emission spectrum lines.
| Characteristics | Values |
|---|---|
| Hottest part of a candle flame | 1,400°C (2,550°F) or higher |
| Colour of the hottest part of the flame | Light blue |
| Temperature of the red portion of the flame | 1,070 K (800°C) |
| Temperature of the yellow portion of the flame | 1,200°C |
| Temperature of the blue zone | 800°C (1,470°F) |
| Temperature of Zone I | 600°C (1,112°F) |
| Temperature of the glass container during normal use | 100–140°F |
| Maximum allowable surface temperature for glass containers | 140°F |
| Maximum allowable surface temperature for metal containers | 125°F |
| Average heat generated by a candle flame | 80–100 watts |
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What You'll Learn
The hottest part of a candle flame is around 1,400 °C
The temperature of a candle flame varies depending on which part of the flame is being considered. The hottest part of a candle flame is around 1,400 °C (2,550 °F), which is located in Zone V, the non-luminous outer zone or veil. This is the point at which complete combustion occurs, and the flame is light blue in colour, although most of it is invisible. The temperature in this zone is determined by the diameter of the wick, with thinner wicks producing smaller flames and thicker wicks producing larger flames.
The temperature of a candle flame decreases as you move away from the hottest point. Zone IV, the middle or luminous zone, is yellow or white and is located above Zone V. This zone is oxygen-depleted, resulting in incomplete combustion. The temperature in this zone is approximately 1,200 °C (2,190 °F).
Zone III, the dark zone, is located directly above the wick and contains unburnt wax. Pyrolysis occurs in this zone, and the temperature is around 1,000 °C (1,830 °F). As we move down the flame, Zone II, or the blue zone, surrounds the base of the flame. In this zone, there is a plentiful supply of oxygen, allowing the fuel to burn clean and blue. The heat from this zone melts the wax, and temperatures are around 800 °C (1,470 °F).
Finally, Zone I is the lowest and coolest part of the candle flame, located around the base of the wick. In this zone, there is insufficient oxygen for the fuel to burn, and temperatures are around 600 °C (1,112 °F). The temperature of a candle flame can be estimated based on its colour, and various factors can affect the temperature, such as the type of wax used, the size and shape of the wick, and the surrounding environment.
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The average temperature of a candle flame is about 1,000 °C
The thermal structure of a flame is complex, with temperatures varying by hundreds of degrees over very short distances, resulting in extremely steep temperature gradients. The temperature of a candle flame can be estimated based on its colour. The lowest and coolest part of the flame, Zone I, is located around the base of the wick where there is insufficient oxygen for the fuel to burn. Temperatures in this zone are around 600 °C (1,112 °F). Zone II, the blue zone, surrounds the base of the flame where there is a plentiful supply of oxygen, causing the fuel to burn clean and blue. This zone reaches temperatures of around 800 °C (1,470 °F) and the heat from this zone melts the wax.
Zone III, the dark zone, is directly above the wick and contains unburnt wax. Pyrolysis takes place in this zone, and the temperature is around 1,000 °C (1,830 °F). Zone IV, the middle or luminous zone, is yellow/white and is located above the dark zone. It is the brightest zone but not the hottest. It is an oxygen-depleted zone with insufficient oxygen to burn all of the wax vapour rising from below, resulting in partial combustion. The temperature in this zone can reach approximately 1,200 °C (2,190 °F).
The non-luminous outer zone or veil, Zone V, surrounds Zone IV and is the hottest part of the flame, with temperatures reaching 1,400 °C (2,550 °F) and complete combustion occurring. It is light blue in colour, although most of it is invisible. The height of a candle flame is primarily determined by the diameter of the wick. Proper wick trimming can reduce soot emissions and help maintain a constant burning temperature.
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The colour of a flame indicates its temperature
The colour of a flame can indicate its temperature. While this is not always the case, as different fuels burn at different colours, the colour of a flame can provide a rough indication of how hot it is.
A typical candle flame, for example, burns at a temperature of around 1,000 to 1,400 degrees Celsius (1,832 to 2,552 degrees Fahrenheit) at its hottest point. This is usually located within the blue part of the flame, which can reach temperatures of up to 2,550 degrees Fahrenheit (1,400 degrees Celsius). The blue colour is due to chemiluminescence, while the visible yellow colour comes from radiative emission from hot soot particles.
The hottest flames are violet, ultra-violet, indigo, and blue. This may be surprising to those who associate heat with the vibrant oranges and reds of a campfire or glowing embers. However, these blue and purple flames indicate a more efficient combustion process, usually reaching higher temperatures than their yellow or red counterparts. A blue flame can indicate a maximum heat output, with temperatures upwards of 1,400 to 1,600 degrees Celsius (2,552 to 2,912 degrees Fahrenheit). Violet flames can exceed even this, reaching temperatures above 1,650 degrees Celsius (3,000 degrees Fahrenheit).
A bright white flame can also indicate extremely high temperatures, exceeding 1,500 to 1,600 degrees Celsius (2,732 to 2,912 degrees Fahrenheit). This is often seen in situations where the fuel and oxygen mix is optimal, such as in a well-calibrated gas burner. White fire indicates a powerful energy release and an intense, efficient burn.
Green fire is a special case. The colour is more a reflection of the chemical composition of the material being burned than the heat of the fire itself. For example, burning copper compounds can produce a vivid green flame. While the temperature of a green flame can vary depending on the chemical being burned, it is generally similar in temperature to blue or orange flames.
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The lowest temperature of a candle flame is around 600 °C
The temperature of a candle flame varies depending on which part of the flame is being measured. The lowest temperature of a candle flame is around 600 °C (1,112 °F), which is known as Zone I. This is the non-luminous, coolest part of the flame located at the base of the wick, where there is insufficient oxygen for the fuel to burn.
As you move up the flame, the temperature increases. Zone II, known as the blue zone, has a temperature of around 800 °C (1,470 °F). This is where the fuel burns clean and blue due to a plentiful supply of oxygen. The heat from this zone is responsible for melting the wax.
Zone III, or the dark zone, is located directly above the wick and has a temperature of about 1,000 °C (1,830 °F). Pyrolysis occurs in this region, where unburnt wax undergoes thermal decomposition.
The middle or luminous zone, known as Zone IV, is yellow or white and is located above the dark zone. This zone is brighter but not as hot as the previous zones, with a temperature of around 1,200 °C (2,190 °F). It is oxygen-depleted, resulting in incomplete combustion of the wax vapour.
The hottest part of the candle flame is Zone V, the non-luminous outer zone or veil, which surrounds Zone IV. This zone reaches temperatures of approximately 1,400 °C (2,550 °F) and is where complete combustion occurs. It is light blue in colour, although most of it is invisible to the naked eye.
The temperature of a candle flame can be estimated based on its colour, with the blue zone indicating a cooler temperature and the yellow or white zone indicating higher temperatures. The height of the flame is primarily determined by the diameter of the wick, with thinner wicks producing smaller flames and thicker wicks resulting in larger flames.
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Flame temperature varies by about 100 °C
The temperature of a candle flame varies significantly depending on the specific zone of the flame being examined. The hottest part of a candle flame is the non-luminous outer zone, or veil, which is light blue in colour and typically reaches temperatures of around 1,400°C (2,550°F). This temperature can vary by about 100°C depending on factors such as the type of wax used, the size and shape of the wick, and the surrounding environment.
The colour of a candle flame is a good indicator of its temperature. The blue zone, which surrounds the base of the flame, burns clean and blue due to a plentiful supply of oxygen. Temperatures in this zone are around 800°C (1,470°F). As the fuel (wax) is melted and burned, the candle becomes shorter, and the yellow/white middle or luminous zone is formed above the wick. This zone is oxygen-depleted, resulting in partial combustion, and has temperatures ranging from 1,000°C (1,830°F) to 1,200°C (2,190°F).
The temperature continues to decrease as we move away from the flame. The red portion of the flame is around 800°C (1,472°F), while the temperature of the molten candle wax can range from 120°F to 400°F depending on the type of wax used. The glass container of a candle is usually the coolest part, with temperatures ranging from 100°F to 140°F during normal use.
The main determinant of the height of a candle flame is the diameter of the wick. A thicker wick will result in a taller flame, while a thinner wick will produce a smaller flame. Proper wick trimming can also reduce soot emissions and help maintain a constant burning temperature.
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Frequently asked questions
A candle flame has multiple zones, each with a different temperature:
- Zone 1 (Non-Luminous Zone) is around 600°C.
- Zone 2 (Blue Zone) is around 800°C.
- Zone 3 (Dark Zone) is around 1,000°C.
- Zone 4 (Luminous Zone) is where the yellow/white flame is located, though it is not the hottest part.
- Zone 5 (Outer Zone) is the hottest part of the flame, at around 1,400°C.
The hottest part of the flame is the base, where the temperature can reach 1,400°C. The colour of the flame in this region is light blue.
Blue flames are the hottest, followed by white. The colder parts of a flame are red, transitioning to orange, yellow, and then white as the temperature increases.
The temperature of a flame is influenced by the type of fuel involved in the combustion. Additionally, the colour of the flame, which is related to the amount of soot present, can indicate the temperature. Blue flames, for example, emerge when the amount of soot decreases.
