Jessie Taylor
Candles are solid cylinders of wax or tallow with a wick that can be burned to produce heat, light, or scent. They are commonly used for celebrations and votive purposes. The act of extinguishing a candle can be described using verbs such as blow out, put out, or snuff out. While candles contribute to indoor air pollution by releasing hydrocarbons, there is limited scientific evidence of significant health risks associated with their usage.
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What You'll Learn
- Candles are made from wax or tallow with a wick in the middle
- Candles are lit to provide light, heat, scent, or for celebration or votive purposes
- Burning candles releases hydrocarbons into the air, which may contribute to indoor air pollution
- The flame of a candle is teardrop-shaped due to convection currents
- The traditional way to extinguish a candle is to use a candle snuffer or to blow it out
Candles are made from wax or tallow with a wick in the middle
A candle is a moulded or dipped mass of wax or tallow with a wick in the middle. The wax is usually made from hydrogen and carbon atoms, which are types of hydrocarbons. When a candle is lit, the heat from the flame melts the wax near the wick. This liquid wax is then drawn up the wick and vaporised, breaking down into hydrogen and carbon molecules. These molecules react with oxygen in the air to create heat, light, water vapour, and carbon dioxide.
While candles are a source of air pollution, there is no definitive proof that they are harmful to human health. However, the type of wax used can affect the amount and kind of emissions produced. For example, paraffin wax, derived from petroleum, tends to generate greater emissions and is often used in cheaper candles. On the other hand, beeswax, soy, or plant-based waxes are considered better alternatives.
The process of lighting a candle and allowing it to burn is often described as "lighting a candle" or "burning a candle". When referring to a candle that is lit, terms like "lit candle" or "lighted candle" are commonly used. Additionally, the phrase "burning at both ends" is used metaphorically to describe someone who is overworked or leading a hectic life.
To extinguish a candle, phrases like "blow out the candle" or "put out the candle" are often used. Alternatively, a candle snuffer can be used, and one might say, "He snuffed out the candle with his fingers."
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Candles are lit to provide light, heat, scent, or for celebration or votive purposes
Candles are a source of light, heat, and scent, and they are also used for celebrations or votive purposes. They are usually made from wax or tallow and contain a wick that can be burned. While candles are a source of light, they also contribute to air pollution by releasing hydrocarbons, chemical compounds consisting of hydrogen and carbon, into the air. The amount and kind of emissions released depend on the type of wax used. For instance, paraffin wax, made from petroleum, tends to generate greater emissions than other waxes.
The process of burning a candle involves the heat of the flame melting the wax near the wick. This liquid wax is then drawn up the wick and vaporized, 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. Approximately one-fourth of the energy created by a candle's combustion is given off as heat, which radiates in all directions.
The colour of a candle flame is not uniform throughout. At the base of the flame is a blue area, where the hydrocarbon molecules vaporize and break apart into hydrogen and carbon atoms. Above this is a small dark orange-brown section, and the large yellow region we typically associate with candle flames is above that. The blue zone is oxygen-rich, and it is here that hydrogen reacts with oxygen to form water vapour, while some of the carbon burns to form carbon dioxide.
In addition to their practical uses, candles are also used for celebrations, such as birthdays, and for votive purposes. The term "lit" is commonly used to describe a candle that is emitting light, and it has become an adjective in its own right. When it comes to extinguishing candles, various terms can be used, including "blow out," "put out," and "snuff out."
The popularity of candles has led to the development of specific candle-related vocabulary, such as "cold throw" and "hot throw," referring to how a candle smells before and after it is lit, respectively. "Top notes," "middle notes," and "base notes" refer to the different fragrances that make up a candle's scent, with base notes often consisting of woodsy scents, vanilla, or amber. "Tunneling" is a term used to describe the problem of a candle burning straight down through the middle, leaving excess wax on the edges. To prevent this, it is important to ensure that the candle's wax pool goes all the way to the edge of the container during the first burn.
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Burning candles releases hydrocarbons into the air, which may contribute to indoor air pollution
Burning candles can indeed release hydrocarbons into the air, which may contribute to indoor air pollution. However, there is no definitive scientific evidence that this poses a significant health risk.
When a candle burns, it releases hydrocarbons, which are chemical compounds consisting of hydrogen and carbon. These hydrocarbons include toluene, benzene, formaldehyde, acetaldehyde, acrolein, and polycyclic aromatic hydrocarbons (PAHs). Toluene is commonly used in paint thinners and adhesives, and exposure without proper ventilation can irritate the eyes, nose, throat, and skin, as well as cause headaches, dizziness, confusion, and anxiety. Benzene is a gas emitted by forest fires, volcanoes, and burning coal or oil, and while it is used in industrial and pharmaceutical settings, the vast majority of benzene exposure comes from smoking. Formaldehyde is also classified by the EU as a "High Priority chemical".
The type of wax and the quality of the candle can affect the amount and kind of emissions generated. For example, paraffin wax, which is made from petroleum, tends to generate greater emissions than other waxes and may contain more formaldehyde-generating materials. Dr. Sobia Farooq suggests avoiding paraffin wax and opting for beeswax, soy, or other plant-based waxes instead. She also recommends avoiding scented or dyed candles, as the dyes used can contain benzidine, which is linked to an increased risk of bladder cancer.
While there is no need to stop burning candles entirely, it is important to choose and burn candles wisely. To minimize the impact of candle emissions, limit the number of candles lit at once, choose unscented, fragrance-free, and uncolored candles made from highly-refined wax, and always burn them in a well-ventilated space.
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The flame of a candle is teardrop-shaped due to convection currents
A candle is a mass of wax or tallow containing a wick that may be burned to give light, heat, scent, or for celebratory purposes. The act of burning a candle is a combustion process that releases hydrocarbons, chemical compounds consisting of hydrogen and carbon, into the air. While this contributes to air pollution, the impact on health is debated.
The teardrop shape of a candle flame is a result of the Earth's gravity. In the late 1990s, NASA scientists conducted experiments in microgravity environments, where the pull of gravity is minimal, to observe how candle flames behaved. In these conditions, without a distinct "up" direction, the flame expands symmetrically in all directions, forming a spherical shape instead of the typical teardrop shape seen on Earth.
The colour of a candle flame is also influenced by the combustion process. The yellow region of the flame is associated with the ignition of carbon soot particles, which emit a full spectrum of visible light. The blue area at the base of the flame and its outer edge is the hottest part, reaching temperatures of approximately 1400° C, as it directly meets with the oxygen in the air.
The wax type and quality of a candle can impact the amount and kind of emissions generated during burning. While there is no definitive proof of harm, some experts suggest avoiding paraffin wax due to its higher emissions and potential presence of formaldehyde-generating materials. Beeswax, soy, or other plant-based waxes are recommended as safer alternatives.
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The traditional way to extinguish a candle is to use a candle snuffer or to blow it out
A candle is a moulded or dipped mass of wax or tallow containing a wick that may be burned to give light, heat, or scent. The traditional way to extinguish a candle is to use a candle snuffer or to blow it out.
Using a candle snuffer is a more practical way to extinguish a candle, especially in Victorian times and earlier when candles were used for illumination. Snuffing out a candle is done by pinching the wick between the snuffer's jaws or by closing the snuffer's bell over the flame to starve it of oxygen.
Blowing out a candle involves using one's breath to move the flame, thereby extinguishing it. This method is commonly associated with birthday cake candles, where blowing out the candles while making a wish is part of the fun. However, blowing out a candle can result in hot wax being splattered, which can be a safety hazard.
To minimise the risk of splattered wax, it is important to blow gently and from a short distance away. Additionally, trimming the wick to the ideal length of 1/4" can help prevent mushrooming, which is the build-up of carbon at the top of the wick that resembles fungi.
Whether using a candle snuffer or blowing out the candle, it is important to follow proper fire safety precautions when handling burning candles. This includes keeping lit candles away from drafts, vibrations, and flammable objects, as well as avoiding touching or moving the candle while it is burning.
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Frequently asked questions
Candles are a usually molded or dipped mass of wax or tallow containing a wick that may be burned to give light, heat, or scent.
Burning candles can contribute to indoor air pollution by releasing hydrocarbons, toluene, and benzene into the air. However, there is little scientific evidence to suggest that they are a danger to one's health.
No, candles are not verbal. However, there are various ways to refer to extinguishing a candle, such as "blow out," "put out," and "snuff out."
Some common ways to extinguish a candle include blowing it out, using a candle snuffer, or smothering it.
Yes, flameless candles and wax melts are alternatives to traditional candles. These options do not pose a fire risk and may produce fewer combustion byproducts.
