Ben Carter
Candles have been used for over two millennia for light, heat, fragrance, and symbolic purposes. The flame of a candle is produced by the combustion of vapourized wax, which is drawn up through the wick and burns in the presence of oxygen. The byproducts of this combustion, water vapour, and carbon dioxide, are invisible, and the heat from the reaction melts more wax, which continues the cycle until the fuel is extinguished or used up. This cycle is what gives the flame its teardrop shape.
| Characteristics | Values |
|---|---|
| Reason for flame | Heat of the flame melts the wax near the wick |
| What happens to the wax | Liquid wax is drawn up the wick by capillary action |
| What happens to the liquid wax | It is vaporized and starts to break down into molecules of hydrogen and carbon |
| What happens to the vaporized molecules | They react with oxygen from the air to create heat, light, water vapour, and carbon dioxide |
| Colour of the flame | Blue at the base, small dark orange-brown section above that, and a large yellow region above that |
| Shape of the flame | Elongated or teardrop |
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What You'll Learn
The combustion process
The hot gas molecules, composed of hydrocarbons, break down into smaller molecules of hydrogen and carbon. This process occurs in the blue zone at the base of the flame, where the oxygen-rich environment facilitates the separation of hydrogen and carbon atoms. The hydrogen atoms react rapidly with oxygen from the surrounding air, forming water vapour (H2O). Some of the carbon atoms also burn in this zone, producing carbon dioxide (CO2).
The orange-brown section above the blue base is where the remaining carbon atoms combust, generating more carbon dioxide. Above this, the large yellow region of the flame is the hottest part, reaching temperatures of up to 1400°C. Here, the combustion process is completed, with the remaining fuel oxidizing and reacting with oxygen to sustain the flame. This zone is responsible for the characteristic teardrop shape of the flame, as the hot air rises, creating a convection current that pulls in cooler air and oxygen at the bottom to replace it.
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Heat and light release
When a candle burns, it releases heat and light energy. The heat of the flame melts the wax near the wick, which is then drawn up the wick by capillary action. The heat of the flame vaporizes the liquid wax, breaking down the hydrocarbons into molecules of hydrogen and carbon. These vaporized molecules react with oxygen from the air to create heat, light, water vapour, and carbon dioxide. The heat radiates in all directions, melting more wax to keep the combustion process going. This cycle of events sustains the flame until the fuel is depleted or the heat is removed.
The blue base of the flame, where oxygen-rich hydrocarbon molecules vaporize and break apart into hydrogen and carbon atoms, is the hottest part, reaching temperatures of up to 1400°C. The hydrogen reacts with oxygen to form water vapour, while some of the carbon burns to form carbon dioxide. Both water vapour and carbon dioxide are invisible, so we don't see them after the wax burns.
The heat generated by the flame also influences the shape of the flame. As the flame heats the surrounding air, it rises, creating a convection current. Cooler air and oxygen rush in at the bottom of the flame to replace the warm air, which also rises as it heats up. This cycle of upward-moving air gives the flame its characteristic teardrop shape.
The combustion process in a candle flame is quite efficient, but if the flame receives too little or too much air or fuel, it can flicker or flare. Incomplete combustion results in unburned carbon particles (soot) escaping from the flame, causing the wisp of smoke sometimes observed.
The release of heat and light from a candle flame is a result of the complex interaction between the wax, wick, and oxygen. The heat melts the wax, which moves up the wick and vaporizes, reacting with oxygen to produce light, heat, and byproducts like water vapour and carbon dioxide. This self-sustaining process continues until the fuel is exhausted or the flame is extinguished.
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Water vapour and carbon dioxide formation
When a candle burns, the heat of the flame melts the wax near the wick. This liquid wax is then drawn up the wick by capillary action. The heat of the flame vaporises the liquid wax, turning it into a hot gas. The hot gas is composed of hydrocarbons, which are molecules of hydrogen and carbon.
As the vaporised wax molecules are drawn up into the flame, they react with oxygen from the air. This reaction produces 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 combustion process going. The flame will burn steadily in a quiet teardrop shape.
The blue area at the base of the flame is where the hydrocarbon molecules vaporize and break apart into hydrogen and carbon atoms. The hydrogen reacts with the oxygen to form water vapour. Some of the carbon burns here to form carbon dioxide. The orange-brown section above the blue area is where more carbon is burned to form carbon dioxide. The large yellow region at the top of the flame is where the combustion process is completed.
The water vapour and carbon dioxide formed during the combustion process are invisible. Thus, when the wax burns, the products of the reaction are not visible, although heat and light are released. The heat from the reaction melts more wax, which is then drawn up the wick to continue the combustion process. This cycle continues until the flame is extinguished or the wax runs out.
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Oxygen's role
Oxygen plays a crucial role in the combustion process that makes a candle burn. When a candle is lit, the heat of the flame melts the wax near the wick. This liquid wax is drawn up the wick by capillary action, and the heat of the flame vaporizes the liquid wax, turning it into hot gas. The vaporized wax molecules are then drawn into the flame, where they react with oxygen from the air. This reaction produces heat, light, water vapour, and carbon dioxide. The heat generated radiates in all directions, melting more wax and fuelling the combustion process until the fuel is depleted or the heat source is removed.
The oxygen-rich blue zone at the base of the flame is where the wax molecules break down into hydrogen and carbon atoms. Hydrogen reacts with oxygen to form water vapour, and some of the carbon burns to form carbon dioxide. The blue colour of this zone is due to its direct contact with the oxygen in the air, and it is the hottest part of the flame, reaching temperatures of up to 1400°C.
As the flame heats the surrounding air, it rises, creating an upward draft. This movement of warm air causes cooler air and oxygen to rush in at the bottom of the flame, replacing the rising air. The cooler air then heats up, rises, and is replaced by more cool air and oxygen, creating a continuous cycle of air movement known as a convection current. This convection current gives the flame its characteristic teardrop shape.
The presence of sufficient oxygen is essential for the candle to burn efficiently. If the flame receives too little or too much air, it can flicker, and unburned carbon particles (soot) may escape from the flame before they can fully combust. This incomplete combustion results in the release of carbon particles as smoke.
Additionally, oxygen plays a role in extinguishing the candle flame. When a candle burns, it consumes oxygen and produces carbon dioxide. If the oxygen supply is cut off, or if the carbon dioxide concentration increases significantly, the flame will go out. This principle is utilised in carbon dioxide fire extinguishers, which release compressed carbon dioxide to displace oxygen and suppress the fire.
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Self-sustaining flame
A self-sustaining flame is a concept that can be applied to both bonfires and ecosystems. In the case of a bonfire, a self-sustaining flame refers to the fire's ability to continue burning without external intervention, such as the use of a flamethrower. This can be achieved by carefully selecting and arranging the logs to create a balanced pile and ensuring sufficient fuel to ignite the fire.
Similarly, in the context of an ecosystem, the self-sustaining flame represents the thriving ecosystem that supports a product or service. This involves various factors, including engineering resources, design, and infrastructure. By focusing on nurturing and growing the ecosystem, organisations can achieve a self-sustaining flame that ensures the success of their offerings.
To create a self-sustaining flame, it is essential to start with a small flame and gradually grow it. This can be done by placing the initial flame in a ball of straw and adding dry kindling as needed. It is crucial to monitor the fire and provide it with more fuel while being cautious not to suffocate it.
In the context of a product or service, this translates to starting with a small but passionate community and gradually building upon it. By sharing ideas and incorporating input from interested individuals, a self-sustaining flame can be achieved. This momentum will lead to a thriving ecosystem where real services with genuine users can be developed and nurtured over time.
Overall, the concept of a self-sustaining flame highlights the importance of starting with a solid foundation, whether it be a small flame or a passionate community, and focusing on growth and nurturing to achieve long-lasting success.
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Frequently asked questions
A candle flame produces light through the combustion of wax, which creates water vapour and carbon dioxide.
When a candle burns, the heat of the flame melts the wax near the wick. This liquid wax is then drawn up the wick and vaporized, breaking down into molecules of hydrogen and carbon. These vapour molecules react with oxygen in the air to create heat, light, water vapour, and carbon dioxide.
A candle flame has three main zones: the blue zone at the base, a small dark orange-brown section above it, and the large yellow region at the top. There is also a fourth zone, sometimes called the veil, which is the faint outside blue edge extending from the base of the flame.
A candle flame needs oxygen to combust. The oxygen reacts with the vaporized wax to produce carbon dioxide and water vapour, releasing heat and light in the process.
A candle flame becomes invisible when the wax is fully combusted, leaving only water vapour and carbon dioxide, which are invisible.
