Does Candle Wax Evaporate When Burnt? Unveiling the Mystery

Does Candle Wax Evaporate When It Is Burnt?

Have you ever wondered where the natural waxes go when you burn a candle? The answer is more complex than you might think. Burning a Scentsy candle involves a fascinating process of melting and vaporizing the wax, which then undergoes evaporation and reacts with oxygen to produce heat and light. As the open flame heats up the wax, it melts and gets drawn up the wick by capillary action. Once it reaches the flame, it vaporizes and undergoes combustion, producing hot gases that rise upwards towards the bulb.

Different types of waxes have different properties when burnt, affecting their burn time and scent release. For instance, paraffin wax is commonly used in candles due to its low cost and easy-to-mold properties. Soy wax is an eco-friendly alternative that burns cleaner than paraffin wax and has a longer burn time. Beeswax is another natural option that produces a warm glow while purifying the air. Scentsy and warmers are popular alternatives to traditional open flame candles, using melted wax to release fragrance into the air.

It’s worth noting that electric wax warmers, like those from Scentsy, do not involve an open flame, so they don’t vaporize natural waxes like traditional candles do. Instead, they use a heating element to melt the wax gradually over time, which results in a longer-lasting scent throw without evaporation.

Does candle wax evaporate when burnt?

Candles, made from natural waxes, have been used for centuries and remain popular today. They come in various shapes, sizes, colors, and scentsy. However, have you ever wondered what happens to the wax when a candle burns under an open flame? Does it evaporate like other materials or undergo a different process?

Candle wax does not evaporate when it is burnt

Contrary to what many people believe, candle waxes do not undergo evaporation when exposed to an open flame. Instead, they undergo a chemical reaction that transforms the solid wax into heat, light, water vapor, and carbon dioxide while also releasing a pleasant scent throw. The process of burning a candle involves several steps that we will discuss below.

How does a candle burn?

When you light a candle wick with a match or lighter, the heat of the flame melts the wax near the wick. The melted waxes are then drawn up the wick by capillary action. Capillary action occurs because of the attraction between molecules in contact with each other, and it allows liquid to flow through narrow spaces without external forces like gravity. During the burn time, some of the wax evaporates into the air, releasing fragrance and creating ambiance. Alternatively, you can use an electric candle to avoid burning waxes altogether.

As the liquid wax of candles moves up the wick towards the flame, it starts to vaporize due to the heat of the flame. Vaporization is a type of evaporation that occurs in waxes and affects their burn time. This phenomenon is also observed in wax warmers, where the heat causes the wax to evaporate and release its fragrance.

Once vaporized, oxygen from air reacts with hydrocarbons in liquid wax used in warmers, producing heat and light as well as water vapor and carbon dioxide gas which are released into surrounding atmosphere. The burn time of the wax depends on the amount used and the size of the open flame.

The process continues until all of the available fuel has been consumed or until something interrupts it (like blowing out or extinguishing). The burn time of the fuel determines how long the warmers will emit heat, melting the wax and releasing the wax vapor from the wax melts.

Why doesn’t candle wax evaporate?

Candle wax and other waxes do not evaporate because evaporation refers only to substances changing from their liquid form to their gaseous form without undergoing any chemical reactions. When heated above its melting point (usually between 50-100°C), wax melts and becomes liquid. When the temperature is further increased, it decomposes into simpler molecules that react with oxygen to produce heat, light, water vapor, and carbon dioxide.

Does candle wax evaporate in a wax warmer?

Wax warmers are devices that use a small electric bulb or tea light candle to melt scented wax cubes or tarts. The melted wax releases fragrance into the air without burning the wick like traditional candles.

While the process of melting wax in a warmer involves heat and vaporization, it does not involve combustion or burning of the wax. Therefore, there is no chemical reaction leading to evaporation of candlewax when using a warmer.

The impact of burning candles on indoor air quality

Harmful chemicals released by burning candles

Candles and wax melts are common household items used for relaxation, ambiance, and lighting. However, the act of burning candles can release harmful chemicals into the air. Two such chemicals are benzene and toluene. To avoid this, consider using electric wax warmers instead of traditional candles.

Benzene is a carcinogen that can cause leukemia and other blood cancers. It is also known to cause respiratory issues, headaches, and dizziness. Toluene is a neurotoxin that can cause developmental damage in children. It can also lead to respiratory issues, headaches, and nausea. If you enjoy using wax melts, be aware that some may contain benzene and toluene. Consider using electric wax warmers as a safer alternative.

When burned, candles made from paraffin wax release these chemicals into the air along with soot particles. Soot particles can irritate the lungs and worsen asthma symptoms.

Natural wax candles as an alternative

To reduce exposure to harmful chemicals released by burning candles, consider using natural wax candles instead of those made from paraffin wax. Natural waxes like beeswax or soy wax do not release harmful chemicals when burned.

Beeswax is a natural wax produced by honeybees and has a sweet scent when burned. Soy wax is derived from soybeans and often comes scented with essential oils.

Another alternative is electric wax-based candles or wax melts which burn cleanly without releasing toxins into the air. They also have an added benefit of being convenient and easy to use, making them a popular choice for many people. Coconut oil-based candles are also a great eco-friendly option since they are made from renewable resources.

Proper ventilation for improved indoor air quality

Even when using natural wax candles, it’s important to ensure proper ventilation in your home while burning them. This helps to reduce exposure to any smoke or soot particles that may be present in the air.

Opening windows or doors allows fresh air to circulate throughout your home while burning candles or using wax melts. Alternatively, you could use an air purifier with a HEPA filter to remove any pollutants from the air, or try electric wax warmers for a flameless option.

It’s also important not to burn too many candles or wax melts at once as this can increase the concentration of pollutants in your home. Limiting candle or wax melt use to one or two at a time can help maintain good indoor air quality.

Is candle wax toxic and where does it go when burnt?

Candle Wax is Not Toxic, But Some Fragrances and Dyes Used in Candles Can Release Harmful Chemicals When Burnt

Candle wax itself is not toxic and is made from natural materials such as beeswax, soy wax, or paraffin. However, some fragrances and dyes used in candles can release harmful chemicals when burned. For example, some scented candles contain phthalates which are known to be endocrine disruptors that can cause hormonal imbalances. Some candle wicks may contain lead which can release dangerous amounts of lead into the air when burned.

To avoid these harmful chemicals, it’s important to choose candles made with natural ingredients such as beeswax or soy wax and without added fragrances or dyes. Look for candles labeled “phthalate-free” or “lead-free” to ensure you’re getting a safe product.

When a Candle is Burnt, the Wax is Melted and Drawn Up the Wick by Capillary Action

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 by capillary action – a process where liquid moves through narrow spaces due to the adhesive properties between molecules – towards the flame. As this liquid wax reaches the flame, it reacts with oxygen in the air to produce heat, light, water vapor, and carbon dioxide.

The Byproducts of Burning Candle Wax Can Leave Soot on Surfaces and Contribute to Indoor Air Pollution if Candles Are Burned in Poorly Ventilated Areas

The byproducts of burning candle wax include soot which can leave black marks on surfaces such as walls or ceilings if candles are burned too close to them. In addition to leaving soot behind, burning candles can also contribute to indoor air pollution if they are burned in poorly ventilated areas. This is because the combustion of wax produces carbon monoxide, nitrogen oxides, and particulate matter which can be harmful to human health.

To minimize the amount of soot produced by burning candles or wax melts, it’s important to keep the wick trimmed to 1/4 inch and to avoid burning them in drafty areas. Make sure that any candle or wax melt you burn is placed on a stable surface away from anything flammable such as curtains or paper.

CO2 and Water Vapor Produced by Burning Candles Mix into the Air

Burning candles are a popular way to create ambiance, add fragrance to a room, and even provide a bit of warmth. But have you ever wondered what happens to the wax when it’s burned? Does candle wax evaporate when it is burnt? Let’s explore this topic in more detail.

The Science behind Burning Candles

When you light a candle, the heat from the flame melts the wax near the wick. This molten wax then travels up the wick via capillary action, where it is heated by the flame until it vaporizes. The vaporized wax reacts with oxygen in the air, creating carbon dioxide (CO2) and water vapor (H2O). These gases mix with the surrounding air and become part of our atmosphere.

What Happens to Candle Wax When It Burns?

As we mentioned earlier, burning candles produce carbon dioxide and water vapor. However, that’s not all that happens. The heat from the flame causes some of the carbon atoms in the wax to break away from their hydrogen bonds and combine with oxygen molecules in the air. This creates new compounds like carbon monoxide (CO), soot particles, and other volatile organic compounds (VOCs).

The scent throw and glow of a candle are also due to this reaction between wax and oxygen. Different types of wax will react differently depending on their chemical composition. For example, beeswax produces less soot than paraffin wax because it contains fewer hydrocarbons.

Are There Any Dangers Associated with Burning Candles?

While burning candles or wax melts can create a cozy atmosphere, they can also be dangerous if not used properly. When burned at high temperatures or for extended periods of time, candles and wax melts can release smoke and carbon monoxide into your home.

Smoke inhalation can cause respiratory problems such as coughing, wheezing, and shortness of breath. Carbon monoxide is a colorless, odorless gas that can be deadly if inhaled in large quantities. It can cause headaches, dizziness, nausea, and even death.

To reduce the risk of these dangers, it’s important to use candles in a well-ventilated area and never leave them unattended. You should also avoid burning candles for more than four hours at a time and keep them away from flammable materials like curtains or bedding.

Equation for Wax Combustion and Candle Wax Combustion

Candles have been used for centuries to provide light, warmth, and ambiance. They are made of wax, which is a flammable substance that burns slowly when lit. Many people wonder whether candle wax evaporates when it is burnt or undergoes some other chemical reaction.

The Equation for Wax Combustion

The equation for wax combustion involves the reaction of wax with oxygen to produce carbon dioxide and water vapor. The general equation for hydrocarbon combustion is:

hydrocarbon + oxygen → carbon dioxide + water vapor

Wax is a type of hydrocarbon, so this equation applies to its combustion as well. When you light a candle, the heat from the flame melts the wax near the wick. This liquid wax travels up the wick by capillary action until it reaches the flame. Once there, it reacts with oxygen in the air to produce carbon dioxide and water vapor.

Candle Wax Combustion

Candle wax combustion occurs when the heat from the flame melts the wax, which then travels up the wick and reacts with oxygen to produce a flame. During this process, there is no evaporation of wax but rather a chemical reaction that results in heat and light being released.

The type of wax used in candles can affect their burning characteristics. For example, beeswax candles burn cleaner than paraffin candles because they do not contain petroleum-based products. Soy candles are also becoming more popular due to their eco-friendliness.

Candle wicks can also impact how well a candle burns. If a wick is too small or too large for a particular candle size or type of wax used, it may not burn evenly or efficiently.

Exothermic Reaction

The combustion of candle wax is an exothermic reaction, meaning it releases energy in the form of heat and light. This is why candles are often used as a source of warmth and ambiance.

The amount of heat released during combustion can be calculated using the enthalpy of combustion, which is the amount of energy released when one mole of a substance is completely burned. The higher the enthalpy of combustion, the more heat will be produced during combustion.

Lund University scientist’s findings on indoor air pollution from burning candles

Burning candles is a common practice in many homes, especially during the holiday season or to create a cozy atmosphere. However, recent studies have shown that burning candles can release harmful pollutants into the air of a room. Lund University scientists conducted research on the effects of burning candles indoors and found some alarming results.

Harmful Pollutants Released by Burning Candles

The type of fuel used in candles, as well as the jar or holder they are burned in, can affect the amount of pollution released. When you burn a candle, it releases soot and other particles into the air. These particles can be harmful to your health when inhaled over time.

Lund University scientists found that burning candles made from paraffin wax (a petroleum-based product) produced high levels of indoor air pollutants such as benzene and toluene. These chemicals are known to cause respiratory problems, headaches, and even cancer with prolonged exposure.

Effects of Burning Candles for Several Hours a Day

Burning candles for several hours a day in homes can contribute to a lot of indoor air pollution. The study showed that after six hours of burning candles, the concentration of pollutants was high enough to cause health concerns.

In addition to releasing harmful pollutants into the air we breathe inside our homes, burning candles also produces carbon dioxide (CO2). CO2 is not toxic but can cause drowsiness and headaches when present in high concentrations.

Alternatives to Burning Candles

If you’re concerned about indoor air pollution caused by burning candles but still want to create an inviting atmosphere at home, there are alternatives you can use instead:

  • Electric Candles: Electric candles provide the same ambiance without producing any pollutants.
  • Beeswax Candles: Beeswax is a natural alternative that burns cleaner than paraffin wax.
  • Soy Candles: Soy candles are another natural alternative that burns cleaner than paraffin wax.

Understanding the Evaporation of Candle Wax When Burnt

In conclusion, burning candles can impact indoor air quality, and while candle wax does not technically evaporate when burnt, it does undergo a process called combustion. The resulting CO2 and water vapor mix into the air, potentially causing health concerns for some individuals. It’s important to be aware of the potential risks associated with burning candles and to take steps to minimize them.

To reduce indoor air pollution from burning candles, consider using beeswax or soy-based candles instead of paraffin wax ones. Ensure proper ventilation in your home by opening windows or using an air purifier. Remember that candle wax is not toxic, but it’s always best to use caution when burning any type of candle.


1. Are there any non-toxic candle options available?

Yes! Beeswax and soy-based candles are great alternatives to traditional paraffin wax candles.

2. Can burning candles cause health problems?

For some individuals, yes. The combustion process releases CO2 and water vapor into the air which can exacerbate respiratory issues like asthma.

3. How can I reduce indoor air pollution from burning candles?

Ensure proper ventilation in your home by opening windows or using an air purifier. Consider switching to non-toxic candle options like beeswax or soy-based candles.

4. Is it safe to burn candles in small spaces like bathrooms?

It’s generally safe as long as there is proper ventilation in place.

5. Do all types of candle waxes release harmful pollutants when burned?

No, not all types do. Traditional paraffin wax is known for releasing more pollutants than other types like beeswax or soy-based waxes.