Brooke Martin
Candles are a simple yet fascinating lighting system. They consist of two main parts: the wick and the wax. When a candle is lit, the wick absorbs and pulls up the liquid wax, which is then burned. This process continues until there is no more wax left. The heat of the flame turns the wax into a hot gas, which breaks down into hydrogen and carbon atoms. These atoms then react with oxygen to create heat, light, water vapour, and carbon dioxide. The combustion process of a candle is so efficient that it can even melt more wax to sustain itself until all the fuel is used up.
| Characteristics | Values |
|---|---|
| Fuel | Paraffin wax |
| Fuel state | Solid at room temperature, melts when lit |
| Wick material | Twine |
| Wick function | Absorbs liquid wax and pulls it upward |
| Wick protection | Vaporizing wax cools the wick |
| Flame temperature | 1000-1200°C |
| Flame colour | Yellow due to ignition of carbon soot particles |
| Combustion by-products | Heat, light, water vapour, carbon dioxide, smoke, soot |
| Optimal burn time | 4 hours |
| Optimal cooling time | 2 hours |
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What You'll Learn
The role of the wick
The wick is a crucial component of a candle, working in tandem with the wax to facilitate the burning process. Its primary function is to absorb and transport the liquid wax, ensuring a consistent fuel supply to sustain the flame. The wick's absorbency is key to its role; it soaks up the melted wax and draws it upwards through capillary action, similar to how a towel absorbs water. This upward movement of liquid wax is essential for the candle's continuous combustion.
The wick's role extends beyond mere wax transportation. As the wick absorbs the liquid wax, it vaporizes it, converting it into a hot gas. This vaporization process is integral to the candle's chemistry. The vaporized wax molecules, composed primarily of hydrogen and carbon, react with oxygen in the air, resulting in combustion. This combustion produces heat, light, water vapour, and carbon dioxide.
The heat generated by combustion plays a dual role. Firstly, it radiates outward, providing the warmth and illumination typically associated with candles. Secondly, it serves a feedback function, melting more wax to perpetuate the cycle. This continuous cycle of wax melting, absorption, vaporization, and combustion is what allows the candle to remain lit.
The wick's role in the candle's combustion process also helps protect itself from excessive burning. As the wax vaporizes, it cools the exposed wick, preventing it from burning too rapidly. This self-cooling mechanism ensures that the wick burns slowly and steadily, prolonging the candle's lifespan.
Additionally, the wick contributes to the candle's overall structure and stability. It holds the wax together, providing a central axis for the wax to surround and solidify around during the candle-making process. Without the wick, the wax would lack structural integrity and be unable to maintain its shape.
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How wax fuels the flame
The wax and the wick work together to keep a candle lit. The wick, made from absorbent material, soaks up the liquid wax as it melts. The wick draws the liquid wax upwards, a process known as capillary action. The lighted wick heats the wax, turning it into a liquid. The liquid wax is then absorbed by the wick and vaporized. The wax vapour burns and keeps the candle lit.
The flame of the candle melts the wax, which then gets absorbed by the wick and burnt. Then, more wax melts and moves up the wick. This process continues until there is no wax left. Occasionally, some melted wax may escape and dribble down the candle, but the wax is the fuel that keeps the flame going.
The wax vapour is drawn into the flame and reacts with oxygen from the air to create heat, light, water vapour, and carbon dioxide. The heat radiates in all directions, with enough heat being created to melt more wax and keep the candle burning. The flame may flicker and smoke a little at first, but once the combustion process stabilizes, the flame will burn steadily.
The wick is prevented from burning too quickly by the wax, which cools the wick and protects it. The vaporizing wax cools the exposed wick, similar to how boiling water in a paper cup prevents the cup from burning. The liquid wax is continually drawn upwards by the wick, ensuring that only a small amount of wax is hot enough to vaporize and burn. This is why the wick doesn't burn up quickly, and the candle stays lit for an extended period.
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The chemical reaction of wax and oxygen
The combustion process in a candle is highly efficient, with minimal soot production. The primary by-products of burning wax are water and carbon dioxide. The water vapour and carbon dioxide gas dissipate into the surrounding air, contributing to the overall heat and light output of the candle. The small amount of soot produced during incomplete combustion can be observed as the yellow colour in the flame, resulting from hot soot particles emitting black body radiation.
The oxygen-rich region of the flame, known as the blue zone, is where the hydrocarbon molecules of the wax vaporize and dissociate into hydrogen and carbon atoms. The hydrogen reacts with oxygen to form water vapour, while some of the carbon burns to produce carbon dioxide. As the gases rise, they encounter higher temperatures, causing further breakdown of carbon molecules and the formation of hardened carbon particles or soot.
The flame's teardrop shape is a result of convection currents created by the rising warm air. As the flame heats the nearby air, it starts to rise, creating a current of upward-moving air. Cooler air and oxygen rush in from the bottom of the flame to replace the warm air, maintaining the cycle. The blue outer edge of the flame, known as the veil, is the hottest part, reaching temperatures of up to 1400° C. It is blue due to its direct contact with the oxygen in the air.
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The colour of the flame
The colour of a candle's flame is determined by several factors, including the temperature, the presence of certain chemicals, and the type of fuel being burned. Typically, a candle flame has four zones, each with its own distinct colour.
The first zone, at the base of the flame, is blue. This is due to chemiluminescence, a byproduct of the chemical reactions taking place in this part of the flame. The blue colour is not indicative of temperature. The second zone is a small dark orange-brown section, where hydrocarbon molecules vaporize and break apart into hydrogen and carbon atoms. The third zone is the large yellow region that we typically associate with candle flames. This is where the formation of carbon (soot) particles increases. As they rise and heat up, they ignite and emit a full spectrum of visible light. The yellow portion of the spectrum is the most dominant, so the human eye perceives the flame as yellowish. The fourth and final zone is the veil—a faint blue edge extending from the base of the flame. This is the hottest part of the flame, reaching temperatures of approximately 1400° C. It is blue because it comes into direct contact with the oxygen in the air.
The colours of a flame can also be influenced by the presence of certain chemicals. For example, adding chemicals like copper chloride to the wax can result in flames of different colours, such as red, green, purple, or blue. However, creating coloured flames in wax candles can be challenging since most of the flame comes from the combustion of vaporized wax. One possible method is to use a fuel source that burns liquid fuel, such as an alcohol lamp with a wick soaked in metal salts dissolved in alcohol. Alternatively, some success has been reported using copper desoldering braid as a wick and treating it with saltwater and a 9V battery to produce a bluish flame.
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How to prevent candles from smoking
Candles are a great lighting system, but they can sometimes emit smoke, which can be a cause for concern. Here are some ways to prevent candles from smoking:
Use a candle snuffer
A candle snuffer is a device used to extinguish a candle's flame safely. Place it over the wick to put out the candle, and leave it on for a few seconds. This reduces the amount of smoke produced. You can also use a wick dipper, which is a metal stick that pushes the wick into the pool of wax, extinguishing the flame.
Trim the wick
Trimming the wick to around 1/4 inch is important for preventing smoking. A longer wick can result in a taller flame, causing the candle to smoke. It can also lead to potential safety hazards. You can use a wick trimmer, scissors, or even a tissue pinched together with your fingers to trim the wick. Ensure that no wick trimmings or debris fall into the candle.
Burn in a well-ventilated room
Always burn your candles in a room with good ventilation, away from drafts, vents, or strong air currents. Incomplete combustion due to too much or too little air reaching the flame can cause smoking.
Avoid debris
Any debris in the candle will add more fuel and can lead to incomplete combustion, resulting in smoke. Keep the candle free of any debris to prevent smoking.
Burn for longer durations
It is recommended to burn your candles for 4-6 hours and let them cool completely before relighting. This helps prevent the build-up of excess wax, which can cause the candle to smoke on subsequent burns.
By following these simple steps, you can enjoy your candles without worrying about excessive smoke or soot marks on your ceiling.
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Frequently asked questions
The heat of the candle flame vaporizes the liquid wax, breaking down the hydrocarbons into molecules of hydrogen and carbon. These molecules are drawn into the flame and react with oxygen to create light.
When you blow out a candle, a stream of white smoke is released from the wick. This smoke is paraffin wax in vaporized form. The wick does not burn because the vaporizing wax cools it.
The wick absorbs the liquid wax and pulls it upward, where it can be burned. If only the wick burned, the candle wouldn't last very long.
A candle flame melts the wax, which soaks up the wick and gets burned. Then, more wax melts, moves up the wick, and burns until there is no wax left.
It is recommended that candles do not burn for longer than four hours and should cool for at least two hours before being relit. Burning a candle for too long will cause carbon to collect on the wick, leading to an unstable flame.
