Jessie Taylor
When a candle burns, the wax does not simply disappear. Instead, it undergoes a chemical process known as combustion, which involves the heat of the flame, oxygen, and fuel. The wick, made of cotton, acts as a fuel source, drawing the liquid wax upwards through capillary action. The wax then evaporates and combusts, transforming into invisible carbon dioxide and water vapour. These gases are released into the surrounding environment, contributing to the humidity of the room. While the combustion of candle wax produces invisible byproducts, it is important to note that incomplete combustion can result in the production of smoke and soot, which can have negative health impacts.
| Characteristics | Values |
|---|---|
| What happens to candle wax when it burns | It turns into carbon dioxide and water vapour |
| What is candle wax made of | Hydrocarbon molecules |
| What happens to the wax when it's heated | It turns from a solid to a liquid and then to a vapour |
| What is the role of the wick | It draws the melted wax up and provides fuel for the flame |
| What happens if the wick is too long | The flame may stutter and burn incorrectly |
| What is candle wax also called | Paraffin |
| What is paraffin | A type of fuel that is solid at room temperature and burns easily |
| What happens if combustion is incomplete | It produces soot (carbon) |
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What You'll Learn
Candle wax turns into water vapour and carbon dioxide gas
When a candle burns, the heat from the flame melts the wax near the wick into a liquid. This liquid wax is then vaporized and reacts with the oxygen in the air. As the wax is consumed, capillary action draws more liquid wax up the wick. The flame will continue to consume the wax as long as there is fuel and enough heat to melt the wax.
The wax molecules are oxidized, meaning they react with oxygen to keep burning. This combustion process is very efficient, releasing water vapour and carbon dioxide gas into the air. The water vapour and carbon dioxide gas dissipate into the surrounding air, along with light and heat.
The specific equation for wax combustion depends on the type of wax used. However, all equations follow a general form, with the wax molecules combining with oxygen to produce carbon dioxide and water vapour. This process is similar to burning wood in a fire, where the wax or wood acts as fuel that is oxidized to release energy.
The combustion of candle wax can also produce small amounts of other gases and compounds, including hydrocarbons. These incomplete combustion products may be sensed as the candle's scent. Additionally, a small portion of the wax mass is converted into heat and light energy, contributing to the overall energy released during combustion.
The choice of wax can impact the combustion products and environmental considerations. For example, soy wax, derived from soybeans, is a popular option due to its renewability, biodegradability, and reduced soot production compared to conventional paraffin wax. Soy wax is also safer and more environmentally friendly as it produces fewer chemicals during combustion. Similarly, natural waxes like beeswax are preferred for reducing chemical emissions.
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The wax is fuel for the flame
When you light a candle, the heat from the flame melts the wax around the base of the wick. The candle shrinks in height as the wax melts and turns into liquid. The heat of the flame then draws the melted wax up the wick, which continues to fuel the flame. The wax is consumed and turns into fuel for the flame.
The wax molecules can burn completely, leaving no ash or wax residue. About one-quarter of the energy from combustion is emitted as heat, which maintains the reaction by vaporizing the wax so that it can burn and melt to maintain the supply of fuel. The reaction ends when there is no more fuel (wax) or insufficient heat to melt the wax.
The wax turns into water vapour and carbon dioxide gas, which dissipates into the air. This process also yields light and heat. Candle wax, also called paraffin, is composed of chains of connected carbon atoms surrounded by hydrogen atoms. These hydrocarbon molecules can also burn into hydrocarbons and water.
The exact equation for wax combustion depends on the specific type of wax used, but all equations follow the same general form. For example, soybean-based candles produce less soot when burned, making them a more environmentally friendly option.
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Wax is oxidised when a candle burns
When a candle burns, the wax is oxidised and transformed into a gas. This is a result of a chemical reaction that produces heat, light, and invisible byproducts. The wax near the wick melts into a liquid, and the heat of the flame vaporises the wax molecules, which then react with the oxygen in the air. This combustion reaction involves the heat of the flame, the presence of oxygen, and fuel. The wax is the candle's fuel, and it is consumed by the flame, leaving no ash or wax residue.
The vaporised wax molecules, now in a gaseous state, are released into the air as carbon dioxide and water vapour. This process is known as oxidation, where the wax burns to yield water and carbon dioxide. The water vapour and carbon dioxide gas dissipate in the air around the candle, along with light and heat. The heat from the flame maintains the reaction, ensuring a continuous supply of fuel.
The combustion of candle wax is considered efficient, as it mostly releases water and carbon dioxide. However, incomplete combustion can occur, resulting in the production of smoke and soot, which is carbon from the incomplete burning of wax. This typically happens when the wax is sucked into the flame faster than it can be burned. Therefore, it is important to ensure proper ventilation when burning candles to prevent the accumulation of soot and its potential impact on respiratory health.
The chemical composition of candle wax contributes to its ability to undergo oxidation during combustion. Candle wax, also known as paraffin, is composed of chains of connected carbon atoms surrounded by hydrogen atoms. These hydrocarbon molecules can burn completely, turning into carbon dioxide and water vapour. The specific type of wax used in a candle will determine the exact equation for wax combustion, but all equations follow a similar general form.
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Wax vapour exists around the flame but doesn't travel far
When you light a candle, the heat from the flame melts the wax around the base of the wick. The candle shrinks in height as the wax melts and turns into liquid. The heat of the flame then vaporizes the wax molecules and they react with the oxygen in the air. This process is called capillary action. During capillary action, the heat of the flame draws the melted wax up the wick, which continues to fuel the flame.
The wax vapour exists right around the flame but does not travel far. This is because the flame consumes the vapour completely, leaving no ash or wax residue. The vapour does not last long once the candle is extinguished. The combustion is efficient, releasing carbon dioxide and water into the air, with minimal soot.
The wax is the fuel for the candle flame. The wick is simply there to maintain the flame in the correct position. The wax burns into hydrocarbons and water. The heat of the flame melts the wax, and the liquid wax is then drawn up the wick, similar to how water is absorbed by a paper towel.
The exact equation for wax combustion depends on the specific type of wax used, but all equations follow the same general form. For example, 100% soy wax produces less soot when burned, making it a safer and more environmentally friendly option.
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Soy wax is a more environmentally-friendly option
When a candle burns, the wax turns into water vapour and carbon dioxide. The wax is vaporised by the flame and reacts with oxygen to keep burning. This process is called combustion, and it is very efficient, releasing minimal soot. However, burning wax does release carbon dioxide, a greenhouse gas, into the atmosphere.
Soy wax is a popular alternative to traditional paraffin wax, which is derived from petroleum, a fossil fuel. Soy wax is made from soybeans, a biodegradable renewable resource. It is considered a carbon-neutral product because the CO2 released during burning is offset by the CO2 absorbed by soy plants during their growth. However, this does not account for the carbon emissions associated with the farming, processing, and transportation of soybeans.
Soy wax candles burn cleaner and produce less soot than paraffin candles, contributing less to indoor air pollution. They also burn more slowly, allowing candles to last longer. Additionally, soy wax is better able to hold and diffuse fragrances, making it a popular choice for scented candles.
While soybeans are natural, turning them into wax is not. The process of making soy wax involves cleaning, cracking, de-hulling, and rolling soybeans into flakes. The oil is then extracted and hydrogenated to solidify it at room temperature. This mechanical process uses a lot of energy and soy wax is often chemically distilled with hexane, bleached with chlorine, deodorized with boric acid, and then hydrogenated. Therefore, it is important to be mindful of the sourcing and production practices to realise the eco-friendly potential of soy wax fully. Look for soy wax labelled as \"non-GMO\" and \"sustainably sourced\" for the most eco-friendly option.
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Frequently asked questions
Candle wax is made up of hydrogen and carbon atoms, also known as hydrocarbons. When a candle burns, the heat from the flame melts the wax, turning it into a liquid. This liquid is then pulled up the wick and evaporates as it touches the flame. The heat breaks down the wax's hydrocarbon chains, turning them into simpler gas molecules. These molecules react with oxygen in the air, causing a combustion process. The end products of this process are carbon dioxide and water vapour, which are released into the air.
The wick is what keeps the candle burning. It draws the liquid wax up into the flame through capillary action, a process where a liquid flows against gravity in small areas. The wick also maintains the flame in the right position.
The white substance is known as soot, which is a product of incomplete combustion. It is made up of carbon particles. To avoid the production of soot, ensure your candle is burning in a well-ventilated area.
Burning low-quality candles can release harmful pollutants such as soot, volatile organic compounds (VOCs), and heavy metals. These can lead to respiratory issues and negatively impact indoor air quality. However, when using high-quality candles made from natural materials, the risk of these issues is significantly reduced.
