Ben Carter
When a candle is lit, the heat of the flame melts the wax, turning it into liquid. This liquid wax then travels up the wick, fuelling the flame until the wax runs out or the heat is removed. The liquid wax is vaporized, breaking down into molecules of hydrogen and carbon. These molecules react with oxygen in the air, producing heat, light, water vapour, and carbon dioxide. Once the flame is extinguished, the liquid wax cools and solidifies. However, if the candle is not burned properly, issues like tunneling can occur, where the wax underneath the flame melts while the surrounding wax remains solid, causing the tunnel to deepen over time.
| Characteristics | Values |
|---|---|
| Phase changes | From solid to liquid to burning vapour |
| Liquid wax | Heated solid wax |
| Solid wax | Room temperature wax |
| Vaporized wax | Combustible, highly-heated liquid wax |
| Flame | Burns cleanly and steadily in a quiet teardrop shape |
| Combustion | Creates heat, light, water vapour, and carbon dioxide |
| Heat | Radiates in all directions and melts more wax |
| Mushrooming | Caused by incomplete combustion due to extra oxygen |
| Fragrance oil | Can leak out of the wax if not bound properly or overloaded |
| Wet spots | Occur when wax contracts and pulls away from the sides of the jar |
| Tunneling | Caused by an uneven melt pool, leading to oxygen deprivation and flame extinguishing |
| Fragrance sweating | Occurs due to generous amounts of fragrance in the wax |
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What You'll Learn
The liquid wax will vaporise and turn into hot gas
When a candle is lit, the heat of the flame vaporises the liquid wax, turning it into a hot gas. This is a crucial step in the combustion process, as the vaporised wax molecules are drawn up into the flame, where they react with oxygen to create heat, light, water vapour, and carbon dioxide.
The liquid wax vaporises and turns into a hot gas due to the heat generated by the candle's flame. This heat causes the wax to change from a solid to a liquid state and then to a gaseous state. The specific temperature at which this phase change occurs depends on the type of wax used in the candle.
The size of the wick also plays a role in the vaporisation process. If the wick is too small, it might not generate enough heat to melt the wax completely. This can lead to a phenomenon known as "tunneling," where only a small portion of the wax surrounding the wick melts, causing the flame to carve out a vertical tunnel in the centre of the candle.
To prevent tunneling, it is recommended to burn the candle long enough, especially during the first burn, to allow the heat to melt the wax evenly across the entire surface. This helps ensure that the liquid wax has a chance to vaporise and fuel the flame properly.
Additionally, the environment in which the candle is burned can impact the vaporisation process. For example, a draft or ceiling fan can introduce extra oxygen, affecting the combustion process and potentially causing incomplete combustion, resulting in soot or smoke.
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The liquid wax will flow up the wick, replacing the vaporised wax
When a candle is lit, the heat of the flame vaporises the liquid wax, turning it into a hot gas. This liquid wax flows up the wick, replacing the just-vaporised wax. The flame melts the wax in the wick, as well as more wax at the base of the wick. This process continues until the wax runs out, or the flame is extinguished.
The liquid wax is fuel for the candle, and it is used up as long as the candle is lit. The vaporised wax molecules are drawn up into the flame, where they react with oxygen from the air to create heat, light, water vapour, and carbon dioxide. The heat created radiates from the flame in all directions and is enough to melt more wax, keeping the combustion process going.
To ensure that the candle burns evenly, it is important to let the wax melt all the way to the edges of the container on the first burn. If the flame is extinguished before this happens, the wax will "remember" and tunnel downward, wasting wax and shortening the candle's lifespan. This is known as candle tunneling, and it occurs when only a small portion of the wax surrounding the wick melts while the candle is lit. The wick descends deeper into the surrounding wax, and the flame can no longer get enough oxygen to sustain itself, causing the candle to go out.
To fix candle tunneling, the outer wax surrounding the tunnel needs to be melted to create an even surface again. This can be done by using a heat gun or hair dryer on low speed and high heat settings, gently heating the top surface of the candle. It is important to hold the heat source at an appropriate distance to avoid blowing melted wax.
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The liquid wax will cool and solidify, causing bumpy tops
When a candle is lit, the heat of the flame vaporizes the liquid wax, turning it into a hot gas. This liquid wax flows up the wick, replacing the wax that has just been vaporized. During this process, some or all of the candle's wax body will become and remain liquid as long as the flame persists.
However, if the flame is extinguished, the whole system will begin to cool down, and the liquid wax will solidify. This process of cooling and solidification can lead to the formation of bumpy tops, also known as "cauliflower tops" due to their resemblance to the surface of a cauliflower. This phenomenon occurs due to polymorphism, which takes place during temperature fluctuations as the liquid wax cools and transitions back into a solid state.
If the wax is left to cool on its own, it will cool unevenly. The wax on the top, sides, and bottom will begin to form crystals while the center continues to cool and set, resulting in an uneven surface. To prevent this, it is recommended to place candles on a wire cooling rack, as solid surfaces can absorb heat and cause the wax to cool too quickly, contributing to the formation of bumpy tops.
Additionally, it is important to note that the first burn of a candle plays a crucial role in determining its future performance. Allowing the wax to melt all the way to the edges of the container during the initial burn helps prevent tunneling, which occurs when the wax remembers its previous melt and tunnels downward, wasting wax and shortening the candle's lifespan. Therefore, ensuring a full melt pool during the first burn can help maintain an even surface and prevent the formation of bumpy tops in the future.
By understanding the behavior of liquid wax during the cooling process and taking preventive measures, such as using a wire cooling rack and ensuring a full melt pool during the first burn, you can minimize the occurrence of bumpy tops and maintain the aesthetic and functional integrity of your candles.
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The liquid wax will melt into a pool, then re-solidify
When a candle is lit, the heat of the flame vaporises the liquid wax, turning it into a hot gas. This gas is drawn up into the flame, where it combines with oxygen to create heat, light, water vapour, and carbon dioxide. The heat generated is enough to melt more wax and keep the combustion process going until the fuel is used up or the heat is removed.
During this process, some or all of the candle's wax body will become and remain liquid as long as the flame persists. When the flame is extinguished, the whole system cools and returns to solid wax. This process is called "phase change".
The liquid wax will melt into a pool and then re-solidify. This is called "tunneling". Tunneling occurs when only a small portion of the wax surrounding the wick melts while the candle is lit. Instead of the wax melting evenly across the surface, it appears as if the flame is carving out a vertical tunnel in the centre of the candle. This causes the tunneling to worsen over time. Once the wick descends deeper into the surrounding wax, the flame won't be able to get enough oxygen to sustain itself, causing the candle to go out.
To prevent tunneling, burn your candle long enough each time so that the entire top surface of wax is melted. This is especially important the first time you burn your candle. A good rule of thumb is to burn your candle for one hour per inch of its diameter. For example, if your candle has a diameter of 3 inches, you should let it burn for 3 hours before putting it out.
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The liquid wax will be used as fuel for the candle's combustion
When a candle is lit, the heat of the flame turns the solid wax into liquid wax, which then becomes vapourised wax. This vapourised wax is combustible and acts as fuel for the candle's combustion. The heat of the flame vaporises the liquid wax, turning it into a hot gas. The liquid wax moves up the wick, replacing the wax that has just been vapourised. This process continues until the wax runs out or the flame is extinguished.
The liquid wax is fuel for the candle's combustion, as it is the wax itself that burns. The liquid wax is drawn up into the flame, where it combines with oxygen from the air to create heat, light, water vapour, and carbon dioxide. This combustion process is highly efficient, and enough heat is created to melt more wax and sustain the process until the fuel is used up or the heat is removed.
The liquid wax is necessary for the candle's combustion, as it is the fuel source. If the wax does not melt properly, it can cause issues such as tunneling, where only a small portion of the wax surrounding the wick melts, creating a vertical tunnel in the centre of the candle. This can lead to the wick not getting enough oxygen, causing the candle to go out. Therefore, it is important to ensure the wax melts evenly to prevent this issue.
The liquid wax also helps to create a steady flame. If there is too little or too much air or fuel, the flame may flicker or flare, and unburned carbon particles (soot) may escape from the flame. By ensuring a steady supply of liquid wax, a more consistent flame can be maintained.
Additionally, the liquid wax can affect the colour and scent of the candle. Fragrance oils added to the wax can cause discolouration, and natural ingredients such as cinnamon and citrus are known to change the colour of the wax. The liquid wax also allows the fragrance to be released into the air, providing the desired aroma.
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Frequently asked questions
It's normal for your whole candle to turn liquid. The liquid wax is fuel for the candle's flame. The heat of the flame vaporizes the liquid wax, and the vaporized wax is drawn up into the flame, where it reacts with oxygen to create heat, light, water vapour, and carbon dioxide.
Candle tunnelling occurs when only a small portion of the wax surrounding the wick melts while the candle is lit. This causes the wax to melt downwards, wasting wax and shortening your candle's lifespan.
To prevent candle tunnelling, ensure that the entire top surface of the wax is melted during the first burn. This may take 3-4 hours, depending on the size of your candle. A good rule of thumb is to burn your candle for one hour per inch of its diameter.
Bumpy tops, also known as "cauliflower tops," are caused by polymorphism. This occurs when there are temperature fluctuations while the liquid wax is cooling and changing back into a solid.
If you see liquid at the bottom of your candle container, it means that your fragrance oil is leaking out of the wax. This could be due to the wax not being hot enough to bind well with the fragrance oil, or it could be due to adding too much fragrance oil.
