Maddie James
Candles are not infinite. As a candle burns, the heat from the flame melts the wax near the wick, which is then drawn up the wick and vaporized. This process breaks down the wax's hydrocarbon molecules into hydrogen and carbon atoms, which react with oxygen from the air to create heat, light, water vapour, and carbon dioxide. While you may reuse some of the leftover wax to create a new candle, a portion of the wax is always lost through heat, light, and smoke, resulting in a net loss of wax over time.
| Characteristics | Values |
|---|---|
| Infinite candle | A paradigm for flickering diffusion flames |
| Candle wax | Evaporates and chemically changes into gases |
| Heat of the flame | Melts the wax near the wick |
| Liquid wax | Drawn up the wick by capillary action |
| Heat of the flame | Vaporizes the liquid wax |
| Vaporized molecules | Drawn into the flame |
| Flame | Receives oxygen from the air |
| Flame | Gives off heat in all directions |
| Candle flame | Has an elongated or teardrop shape |
| Candle flame in microgravity | Spherical |
| Candle wick | Burns forever |
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What You'll Learn
Candle wax converts to heat, light and smoke
Candle wax is not infinite. While it may seem like the wax is simply melting and hardening, it is actually being converted into heat, light, and smoke through a process of combustion. This process is not completely efficient, as the heat melts the wax faster than it can burn it, resulting in excess liquid wax that drips or puddles around the candle.
When a candle is lit, the heat of the flame melts the wax near the wick. This liquid wax is then drawn up the wick through capillary action. As the wax vaporizes, it breaks down into molecules of hydrogen and carbon, which react with oxygen in the air to create heat, light, water vapour, and carbon dioxide. The heat radiates from the flame in all directions, warming the nearby air and causing it to rise, creating a convection current that gives the flame its teardrop shape.
The blue base of the flame is oxygen-rich, and this is where the hydrocarbon molecules vaporize and break apart into hydrogen and carbon atoms. The hydrogen reacts with oxygen to form water vapour, while some of the carbon burns to form carbon dioxide. In the dark orange-brown region above, there is less oxygen, and various forms of carbon continue to break down, forming small, hardened carbon particles that rise with the water vapour and carbon dioxide.
As the candle continues to burn, the height of the melted section gradually drops, indicating how much wax has been converted into heat, light, and smoke. With each burn, there is always less wax than when you started, as some of it has been lost through combustion and drippings. This loss of wax with each burn means that candles are not infinite and will eventually burn out.
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Liquid wax is drawn up the wick
When a candle is lit, the heat from the flame melts the wax near the wick. This process is faster than the wax burning, which is why there is often a pool of liquid wax around the wick. This liquid wax is drawn up the wick through a process called capillary action. The heat of the flame then vaporizes the liquid wax, turning it into a hot gas.
The wax used in candles is made up of hydrocarbons, which are molecules composed of hydrogen and carbon atoms. When the liquid wax is vaporized, it breaks down into these individual molecules. These hot molecules are then drawn up into the flame, where they react with oxygen from the air. This reaction creates heat, light, water vapour, and carbon dioxide.
The blue area at the base of the flame is where the hydrocarbon molecules vaporize and break down into hydrogen and carbon atoms. The hydrogen reacts with the oxygen in the air first, forming water vapour. Some carbon also burns in this zone, forming carbon dioxide.
As the water vapour, carbon dioxide, and remaining carbon molecules rise, they are heated to around 1000 degrees Centigrade. In the yellow zone of the flame, the formation of carbon soot particles increases. This is why the flame leaves a trail of smoke and why there is always less wax at the end of burning a candle. Some of the wax is converted into heat, light, smoke, and gas. Therefore, while the wax may seem to disappear, it is simply changing form and being used up.
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Hydrocarbons break down into hydrogen and carbon
Candles are not infinite. Every time a candle burns, some of the wax is converted to heat, light, and smoke. This is because waxes are essentially hydrocarbons, which are molecules consisting of hydrogen and carbon atoms. When a candle is lit, the heat of the flame melts the wax near the wick, and this liquid wax is drawn up the wick by capillary action. The heat of the flame then vaporizes the liquid wax, turning it into a hot gas, and breaking down the hydrocarbons into molecules of hydrogen and carbon.
Hydrocarbons are the primary constituent of fossil fuels, namely natural gas, petroleum, and coal. They are also found in crude oil. Fossil fuel resources are often referred to as hydrocarbon resources. Different hydrocarbons have different ratios of hydrogen to carbon, and so they produce different ratios of water to carbon dioxide when burned. For example, since coal contains the longest and most complex hydrocarbon molecules, burning coal releases more carbon dioxide than burning the same mass of oil or natural gas.
The combustion of hydrocarbons with oxygen produces carbon dioxide, water, and heat. This process is a major contributor to anthropogenic global warming. The combustion of carbon compounds, especially hydrocarbons, has been the most important source of heat energy for human civilizations throughout recorded history.
Complete combustion of any hydrocarbon, given sufficient oxygen, will produce carbon dioxide and water. However, the combustion of hydrocarbons tends to be less complete as the number of carbon atoms in the molecules rises. The bigger molecules don't vaporize as easily, and so the reaction is much better if the oxygen and the hydrocarbon are well mixed as gases.
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Heat radiates from the flame
The heat from a candle flame is a result of the combustion of wax, a process that involves the conversion of solid wax into heat, light, and smoke. This combustion process is not completely efficient, as the heat melts the wax faster than it can burn it, resulting in excess liquid wax that drips or puddles around the wick. This liquid wax can be reused to create a new candle, but with each burning, some wax is lost to heat, light, smoke, and drippings.
The heat from the flame radiates in all directions and is responsible for the characteristic teardrop shape of the flame. As the flame heats the air, it causes the warm air to rise, creating a convection current. Cooler air and oxygen are then drawn into the base of the flame to replace the rising warm air. This cycle of upward-moving air gives the flame its familiar shape.
The heat from the flame also plays a crucial role in the vaporization of the wax. When a candle is lit, the heat of the flame melts the wax near the wick, and this liquid wax is drawn up the wick through capillary action. The heat then vaporizes the liquid wax, turning it into a hot gas and breaking down the hydrocarbons into molecules of hydrogen and carbon. These vaporized molecules are drawn into the flame, where they react with oxygen to produce heat, light, water vapour, and carbon dioxide.
The blue area at the base of the flame is the oxygen-rich zone where the hydrocarbon molecules vaporize and separate into hydrogen and carbon atoms. The hydrogen reacts with oxygen to form water vapour, while some of the carbon burns to form carbon dioxide. As the water vapour and carbon dioxide rise through the flame, they encounter higher temperatures, causing the continued breakdown of carbon particles and the formation of soot.
The heat radiated from the flame is not infinite, as it is dependent on the amount of wax available for combustion. With each burning, some wax is lost, and over time, the candle will eventually be consumed, and the flame will extinguish. However, the heat from the flame is an essential part of the candle's combustion process, transforming solid wax into energy and light.
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Wax evaporates and chemically changes
When a candle burns, the flame heats the air around it, causing the warm air to move up and creating a current of upward-moving air, known as a convection current. This current gives the flame its distinctive teardrop shape.
The heat of the flame first melts the wax near the wick. This liquid wax is then drawn up the wick and vaporized by the heat of the flame, turning into a hot gas. The hydrocarbons that make up the wax begin to break down into molecules of hydrogen and carbon. These gases are then drawn into the flame and react with the oxygen in the air. This reaction produces heat, light, smoke, water vapour, and carbon dioxide.
The blue area at the base of the flame is oxygen-rich, and it is here that the hydrocarbon molecules vaporize and break apart into hydrogen and carbon atoms. The hydrogen reacts with the oxygen to form water vapour, and some of the carbon burns to form carbon dioxide. In the dark orange-brown region above, there is less oxygen, and various forms of carbon continue to break down, forming small, hardened carbon particles. These particles, along with the water vapour and carbon dioxide, are heated to around 1000 degrees Celsius as they rise. At the bottom of the yellow zone, the formation of carbon soot particles increases.
Thus, through the process of combustion, the wax is chemically transformed into heat, light, smoke, water vapour, and carbon dioxide. This process is not completely efficient, as some of the wax is lost as drippings or puddles. Therefore, each time a candle burns, there is less wax, and eventually, no wax is left.
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Frequently asked questions
No, candles are not infinite. When a candle burns, the heat of the flame melts the wax near the wick. The liquid wax is then drawn up the wick and vaporized, turning into hot gas. This gas escapes into the atmosphere, and the wax is converted into heat, light, and smoke.
The vaporized wax molecules are drawn up into the flame and react with oxygen from the air. This creates heat, light, water vapour, and carbon dioxide.
Every time a candle burns, some of the wax is converted into heat, light, and smoke, and escapes into the atmosphere. Therefore, there is always less wax at the end of the burn.
