Maddie James
Candles are a simple yet fascinating lighting system, with the fuel and the wick being the two main components that work together to keep the candle burning. The process of burning a candle involves the heat of the flame, the presence of oxygen, and fuel. When a candle burns, the wax melts and flows up the wick, where it evaporates and the wax vapour burns. The wax is transformed into carbon dioxide, water vapour, and a small amount of ash, which are invisible and mix into the air in the room. This continues until the wax runs out or the candle is extinguished.
| Characteristics | Values |
|---|---|
| What happens when a candle burns | The wax is drawn up the wick where it oxidises (burns in the presence of oxygen) and turns into water vapour and carbon dioxide. |
| The wax also vaporises and turns into flammable gas vapour, which then combusts into a flame. | |
| The wick absorbs the liquid wax and pulls it upward. | |
| The wick also burns, but the wax contributes most of the heat. | |
| What happens when a candle is blown out | The smoke released is made of byproducts that didn't burn completely, including wax particles. |
| The smoke is also paraffin wax in vapourised form, which is hot enough to relight the candle. |
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What You'll Learn
The wick absorbs liquid wax and pulls it upward
The wick is a crucial component of a candle. It is typically made of cotton or twine and is designed to be highly absorbent, almost like a towel. This absorbency is essential for the candle's function, as it allows the wick to absorb the liquid wax and transport it upwards through a process known as capillary action.
When a candle is lit, the heat of the flame melts the solid wax near the wick. The wick then absorbs this liquid wax and pulls it upwards through capillary action. This absorbed wax acts as fuel for the flame, and it vaporizes and combusts at the tip of the wick due to the high temperature.
The upward movement of liquid wax through the wick is a continuous process that occurs as long as there is enough wax to melt and absorb. The wick's absorbency ensures that the liquid wax is drawn upwards, providing a consistent fuel source for the flame. This is why candles gradually diminish in size until little or no wax remains.
The liquid wax that is pulled upwards through the wick undergoes a chemical transformation. As the wax vaporizes and reaches its ignition temperature, it combusts and produces carbon dioxide, water vapour, and a small amount of ash. These gases are invisible and mix with the air in the room, eventually dispersing into the atmosphere.
The process of the wick absorbing and transporting liquid wax is a fundamental aspect of how candles function and burn. The wick's ability to draw up and vaporize the wax is what allows the candle to continue burning until the wax runs out or the flame is extinguished.
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The wax turns into water vapour and carbon dioxide
The process of a candle running out is a fascinating one. It involves a series of chemical reactions and physical changes that ultimately lead to the disappearance of the wax. This transformation occurs through the following steps:
Firstly, it's important to understand that candle wax, whether soy, paraffin, beeswax, or another type, is composed of hydrogen and carbon atoms, known as hydrocarbons. These hydrocarbons exist in a solid state at room temperature, which is why we see the wax as a solid, formed candle. When a candle is lit, the flame's intense heat causes the wax near the wick to melt and become liquid. This liquid wax is then drawn up through the wick, a process facilitated by the wick's absorbency and capillary action.
As the liquid wax travels up the wick, it reaches the flame, where it undergoes a critical transformation. The heat from the flame vaporizes the wax, turning it into a flammable gas. This vaporized wax combines with oxygen in the air and combusts, releasing light and heat. This combustion process is what keeps the candle burning. However, it's important to note that not all the wax is completely burned.
During combustion, the wax molecules are transformed into carbon dioxide and water vapour. These gases are invisible and quickly mix with the surrounding air, becoming unnoticeable. While most of the wax becomes these gases, a small portion may be left over as ash or particles of wax that are flung away from the flame, contributing to smoke and soot. Over time, as the candle continues to burn, more and more of the solid wax is converted into these invisible gases, causing the candle to gradually diminish in size until little or no wax remains.
The heat from the reaction also melts more wax, which is then drawn up the wick to continue the process. This cycle continues until the flame is extinguished or the wax runs out. Therefore, the "disappearance" of the wax is not a vanishing act but a chemical transformation into water vapour and carbon dioxide, with a small amount of residual ash or unburned wax particles.
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Wax vapor burns, keeping the candle burning
When a candle burns, the wax doesn't simply disappear. The wax is drawn up the wick and vaporised by the heat of the flame, turning into a gas. This process is known as vaporisation. The gaseous wax then fuels the flame, which in turn melts more wax, creating a continuous cycle.
The vapourised wax molecules react with the oxygen in the air, causing the hydrocarbons in the wax to split into hydrogen and carbon molecules. This chemical reaction produces heat, light, water vapour, and carbon dioxide. The water vapour and carbon dioxide mix into the surrounding air, and the heat sustains the flame, creating the candle's warm glow.
The flame of the candle comes from burning the wax, not the wick. The wax is the fuel that sustains the flame. The wick provides a channel for the melted wax to travel up towards the flame, where it is heated sufficiently to turn into gas and combust. The charring of the wick during this process is mostly incidental.
The wax vapour is what burns to keep a candle burning. The continuous cycle of wax melting, being drawn up the wick, and then vaporised to fuel the flame, ensures that the candle continues to burn until the wax runs out or the flame is extinguished. The heat from the flame is essential to this process, as it melts the wax and transforms it into gas, allowing it to react with the oxygen in the air and sustain the candle's light and warmth.
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The wax eventually runs out
When a candle burns, the wax eventually runs out. This is because the wax is the candle's fuel. The wick, which is usually made of cotton, absorbs the liquid wax and pulls it upwards through capillary action. The flame of the candle comes from burning the wax, not the wick.
The wick only burns to initially heat the wax. Once the wax reaches its ignition temperature, it continues to burn and fuel the flame. The heat of the candle's flame causes the wax to melt and vaporize, turning it into flammable gas vapour. This vapour then combusts into a flame when reacting with oxygen in the air. The combustion reaction transforms the solid wax into invisible carbon dioxide gas and water vapour.
The carbon dioxide and water vapour produced by the burning candle cool and mix into the air in the room. Over the next few hours, as the indoor air is exchanged with outdoor air, the molecules from the candle will escape the room and begin to disperse into the atmosphere. After about a year, atoms from the burnt candle will have spread around the globe.
However, candles do not burn perfectly. Around the edges of the flame, clumps of carbon molecules are flung away before they finish burning, contributing to smoke and soot. These particles can settle in weird places around the candle, tossed into the air as smoke and then settling after a minute or two.
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The gases produced mix with the air in the room
When a candle burns, it produces gases that mix with the air in the room. The heat of the candle's flame causes the wax to melt and vaporize, turning it into a flammable gas. This vapour then reacts with the oxygen in the air, causing the vapour to combust and produce a flame.
The combustion of the vapour releases heat, light, carbon dioxide, and water vapour. Both carbon dioxide and water vapour are invisible gases, which mix with the air in the room. Over time, as the air in the room is exchanged with outdoor air, the molecules from the candle will escape the room and begin to disperse into the atmosphere. After about a year, the atoms from the candle will have spread around the globe, and people will be breathing in carbon atoms from the wax and oxygen atoms from the air in the room.
The amount of carbon dioxide and water vapour produced by a candle is relatively small and comparable to the amount exhaled by another person in the room. However, constant exposure to the tiny particles released by candles can contribute to indoor air pollution and lead to cardiovascular and respiratory diseases. Therefore, it is recommended to burn candles for only 3-4 hours at a time.
In addition to carbon dioxide and water vapour, a small amount of wax particles may also be released into the air. These particles are formed when clumps of carbon molecules are flung away from the flame before they finish burning. These particles contribute to smoke and soot and can settle in various places around the candle.
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Frequently asked questions
The wick absorbs the liquid wax and pulls it upward. The flame causes the wax to melt, flow up the wick, and evaporate, and then the wax vapour burns.
Candle wax is composed of hydrogen and carbon atoms, called hydrocarbons.
The wax turns into carbon dioxide, water vapour, and a little bit of ash.
The candle continues to burn until it runs out of wax or oxygen.
The smoke released is made up of byproducts that didn't completely burn, including tiny particles of wax.
