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There is something hypnotic about a candle flame. It dances, it flickers, it warms. But have you ever stopped to wonder what is actually happening inside that tiny, luminous teardrop of fire? What is burning, exactly? The wick? The wax? And where does the wax go as the candle grows shorter?
At Tabo, we believe that understanding the science behind the flame deepens our appreciation for every candle we create. The journey of a candle from solid wax to invisible gas is a remarkable story of physics and chemistry—a story of transformation that has fascinated scientists for centuries, from Michael Faraday to modern researchers.
In this article, we will take you on that journey: from the moment you strike a match to the final wisp of smoke. You will discover why a candle burns the way it does, what the flame is made of, and why the type of wax you choose matters more than you might think.
Before we can understand how a candle burns, we need to know what we are burning.
Most modern candles are made from paraffin wax, a byproduct of petroleum refining. Paraffin is a mixture of several high-molecular-weight alkanes—primarily docosane (C₂₂H₄₆) and octacosane (C₂₈H₅₈). These are long chains of carbon and hydrogen atoms. Paraffin wax contains about 85% carbon and 14% hydrogen.
The wax is threaded with a wick, typically made of braided cotton or other absorbent material. The wick's job is not to burn (though it will eventually char), but to act as a delivery system—a tiny fuel pump that draws melted wax upward into the flame.
When you strike a match and hold it to the wick, you are providing the initial energy needed to start the process. The heat from the match flame raises the temperature of the wax closest to the wick.
At this point, three things happen in rapid succession:
First, the solid wax near the flame begins to melt. This is a physical change—the wax is changing state from solid to liquid, but its chemical composition remains the same.
Second, the molten liquid wax is drawn upward into the wick. How? Through capillary action—the same force that pulls water up through a paper towel-. The wick acts like a sponge, absorbing the liquid wax and transporting it toward the flame.
Third, as the liquid wax reaches the heat of the flame, it vaporizes—turning from liquid into gas. This is another physical change, but it is the crucial step that makes combustion possible-.
Here is the key insight that surprises many people: the wax itself never actually burns in its solid or liquid form. What burns is the wax vapor—the gaseous form of the wax.
Once the wax has been vaporized, the real magic begins. The wax vapor rises from the wick and mixes with oxygen from the surrounding air. When the temperature is high enough—around 600°C (1112°F) for paraffin wax—the vapor ignites.
This ignition is a chemical reaction called combustion. The hydrocarbon molecules in the wax vapor react with oxygen (O₂) to produce carbon dioxide (CO₂) and water (H₂O)-.
The simplified chemical equation looks like this:
Wax (hydrocarbons) + O₂ → CO₂ + H₂O + heat + light-
This reaction releases energy in two forms: heat (which keeps the candle burning) and light (the glow we see as the flame).
Once the candle is lit, it becomes self-sustaining. The heat from the flame melts more solid wax, which is drawn up the wick, vaporized, and burned—producing more heat to continue the cycle-. This is why a candle will continue burning steadily until the wax is depleted or the flame is extinguished.
As one source explains: "Flame provided enough heat to keep the candle itself maintaining this chain reaction: the flame heated the wax on the top to melt it, the liquefied wax climbed up the wick due to capillary effect, then vaporized into steam and burned in the flame".
If you look closely at a candle flame, you will notice it is not uniform. It has structure. Scientists divide the flame into three distinct zones:
This is the outermost layer of the flame, where the wax vapor comes into full contact with oxygen from the air. Because combustion is most complete here, this zone is the brightest and the hottest—reaching temperatures that can char a matchstick in about one second-.
The middle zone, where combustion is less complete. There is less oxygen available here, so some of the wax vapor burns only partially. This zone is dimmer and cooler than the outer flame.
The innermost region, directly above the wick. This zone contains mostly unburned wax vapor that has not yet reacted with oxygen-. It is the coolest part of the flame—so cool, in fact, that you can briefly pass a object through it without it catching fire.
The classic teardrop shape of a candle flame is not accidental. It is the result of convection. As the hot gases from combustion rise, they are replaced by cooler, denser air from below-2. This creates a continuous flow of fresh oxygen to the flame.
If you were to light a candle in zero gravity, where convection does not occur, the flame would become spherical rather than teardrop-shaped. The familiar shape we know is actually a product of Earth's gravity working together with the physics of hot and cold air.
Blow out a candle, and you will see a thin wisp of white smoke rising from the wick. What is that smoke?
It is wax vapor that has cooled and condensed back into tiny solid particles of wax. The wick and the surrounding wax remain hot for a few seconds after the flame is extinguished, so vaporization continues—but without a flame to burn the vapor, it simply escapes into the air and condenses.
Here is a classic party trick: if you hold a lit match to that white smoke immediately after blowing out the candle, the flame will travel down the smoke and re-ignite the candle—even without touching the wick. This works because the smoke contains unburned wax vapor, which is still flammable.
If you have ever watched a candle burn down, you may have wondered: where does all that wax go? It does not simply disappear.
The wax is converted into invisible gases—carbon dioxide and water vapor—which disperse into the air-. As long as the wax does not drip away from the flame, the flame will consume it completely, leaving no ash behind-.
In a properly burning candle, the only visible change is the shortening of the candle itself. The mass of the wax has not vanished; it has simply changed form, from a solid you can see to gases you cannot.
At Tabo , we choose beeswax for our candles—not just for its beauty and symbolism, but for its superior burning properties.
Beeswax has a melting point of approximately 62-64°C (144-147°F) —significantly higher than paraffin. This higher melting point means beeswax burns hotter and more completely, reducing the formation of unburned carbon particles (soot).
Because beeswax is a natural product rather than a petroleum byproduct, it contains no synthetic additives or flame retardants. It burns with a bright, steady flame and produces virtually no soot or smoke when burned correctly.
When beeswax burns, it releases negative ions into the air. These ions bind to positively charged airborne particles—such as dust, pollen, and mold spores—neutralizing them and effectively purifying the air you breathe.
Pure beeswax releases a gentle, natural scent of honey and nectar as it burns. It is never overpowering—just a subtle reminder that this flame comes from living creatures, from flowers, from the sweetness of creation.
If you are burning a scented candle, the journey from solid to gas becomes slightly more complex. Fragrance oils are blended into the wax, and when the wax vaporizes, those fragrance molecules are released into the air along with the wax vapor.
This is why a candle can fill an entire room with fragrance even when the flame is small—the scent is carried by the very same vaporization process that fuels the flame.
Understanding how a candle burns also helps us respect its power:
Never leave a burning candle unattended. The flame is sustained by a continuous supply of fuel and oxygen—and it will continue burning until one of those runs out.
Keep candles away from drafts. Drafts cause the flame to flicker, which can lead to uneven burning, soot production, and even fire hazards.
Trim the wick to ¼ inch before each lighting. A wick that is too long produces a larger, hotter flame that burns wax faster and creates more soot.
Stop burning when only ½ inch of wax remains. Burning beyond this point risks overheating the container, which can crack or shatter.
Every time you light a candle, you are witnessing one of nature's most elegant transformations. A solid piece of wax, through the application of heat, becomes a liquid, then a gas, then a flame—and finally, invisible gases that drift away into the air.
It is a journey that requires precise conditions: the right temperature, the right fuel, the right amount of oxygen. And it is a journey that has captivated scientists for centuries—from Michael Faraday's famous Christmas lectures on the chemical history of a candle to modern researchers studying flame dynamics in microgravity.
At Tabo , we are honored to be part of this journey. Our beeswax candles are crafted with care, designed to burn cleanly and beautifully, transforming from solid wax into warm light and pure air.
The next time you light one of our candles, take a moment to watch the flame. Think about the remarkable journey happening inside that tiny teardrop of fire—from solid to liquid to gas, from wax to light, from earth to air.
It is, quite simply, a wonder.
Waiting for our long-terms and friendly cooperation.
EN
