Vivian Marlowe
Alcohol has been used as a beverage and a fuel for fire for centuries. The flammability of alcohol depends on its proof, with anything above 80 proof or 40% ABV catching fire. Liquors with a proof above 100 are deemed to be flammable and can sustain a flame, with some sources claiming that alcohol becomes flammable at 57% ABV. The temperature of the alcohol also plays a role in its flammability, with some liquors burning when heated.
| Characteristics | Values |
|---|---|
| Flammability | Depends on the proof of the alcohol |
| Anything above 80 proof will catch fire | |
| Anything below 80 proof will not be potent enough to burn | |
| Liquors with 50% alcohol or 100 proof will burn | |
| Liquors with 40% alcohol or 80 proof may sputter and smoke | |
| Liquors with 38% alcohol will burn momentarily | |
| Liquors with 45-74% alcohol will catch on fire | |
| Liquors with 75.5% alcohol or 95% will maintain a consistent flame | |
| Liquors with 55% alcohol will erupt when lit | |
| Wine with 9% alcohol will burn if poured into a hot pan | |
| Wine with 14% alcohol is flammable | |
| Beer with 5% alcohol is flammable | |
| Beer with a high water content can be used to quench flames | |
| Isopropyl is highly flammable | |
| Ethanol is flammable | |
| Molotov cocktails may contain alcohol | |
| Flambéing requires liquor to be heated |
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What You'll Learn
Flammability depends on proof and ABV
Flammability does depend on proof and ABV, but it's not quite as simple as a binary flammable/non-flammable distinction. The higher the proof, the more flammable the alcohol will be, but other factors such as temperature and the presence of other ingredients can also play a role.
In the 18th century, alcoholic beverages were defined by their "proof", which indicated their relative dilution and combustibility. A liquor was considered 100 proof if it could sustain the combustion of gunpowder. This corresponded to around 57% alcohol. Since then, the proof scale has been adjusted, and today 100 proof is defined as 50% alcohol. While this will still burn if mixed with air, it won't ignite gunpowder.
Liquors that are 100 proof or higher will ignite, and those above 80 proof will catch fire and make suitable fuel for flambe. However, even some liquors below 80 proof can ignite, especially when heated. For example, wine, which is typically 9% alcohol, will burn if poured into a hot pan near a gas stove. Temperature is a significant factor, as a liquor that doesn't burn at room temperature may ignite when heated.
The presence of other ingredients can also affect flammability. For instance, Sambuca, which contains anise oil and sugar, is known to produce large blue flames when ignited. On the other hand, too much water can hinder flammability.
It's worth noting that while some alcoholic drinks can be flammable, not all alcohol is flammable. Beer and wine, for example, are typically not flammable due to their high water content. However, large barrels of beer and wine in storage or during manufacturing can be combustible due to the materials used.
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ABV: 40%+ alcohol will ignite
The flammability of alcohol depends on its proof, which is related to its ABV (alcohol by volume) rating. In the United States, proof is always double the ABV percentage. For instance, a drink that is 40% ABV is considered 80 proof.
Liquors with a proof of 80 or above will catch fire, making them suitable as fuel or for flambe. Liquors with a proof of 100 or above (50% ABV) will produce a steady flame.
However, some sources suggest that liquors with a proof of 80 may not burn consistently. For example, 80-proof red-label Smirnoff will only fire splutter for half a second, whereas 100-proof blue-label Smirnoff will ignite. Similarly, 80-proof vodka may sputter and smoke, but it will ignite. This may be due to the temperature, as a liquor that does not have enough alcohol to burn at room temperature may burn when heated.
Other factors, such as the other ingredients in the liquid, may also affect flammability. For example, wine, which has an ABV of around 9%, will burn if poured into a hot pan on a gas stove. However, this is due to the ethanol vapour in the air above the pan being ignited, rather than the wine itself.
Therefore, while 40% ABV alcohol will ignite, it may not produce a steady flame, and factors such as temperature and other ingredients may influence its flammability.
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100 proof = 50% alcohol
The term "proof" when applied to alcohol originally referred to a test conducted in the 18th century to determine the potency of an alcoholic beverage. A small pellet of gunpowder would be soaked in the beverage, and if the gunpowder ignited, the alcohol was deemed to be "100 proof". This was found to correspond to around 57% alcohol.
Since then, the proof scale has been adjusted, and today 100 proof alcohol is defined as 50% alcohol. This will still burn if mixed sufficiently with air, but will not allow gunpowder to ignite. Liquors become flammable at over 100 proof, which is 50% alcohol. However, 80 proof (40%) liquor may sputter and smoke a little, and temperature is also a factor. For example, a liquor that does not have enough alcohol to burn at room temperature may burn when heated, as in the case of flambé.
In the United States, vodka must be at least 80 proof or 40% ABV, and therefore it is flammable. Whiskey is similar, with most bottles around 40% ABV or 80 proof.
The flash point of a liquid is the temperature at which it will ignite when met with a flame. Alcohol has a very low flash point and can ignite even when cold. However, other components mixed into it will have higher flash points, and the flash point of a mixture will depend on the percentage of each ingredient.
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80 proof = 40% alcohol
The flammability of alcohol depends on its proof. Liquors with a proof of 80 or higher will catch fire, making them suitable for fuel and flambe. Liquors with a proof of 100 or higher will produce a steady flame.
In the United States, vodka must be at least 80 proof or 40% ABV. This means that vodka is flammable and will provide a steady burn until all the alcohol has been used up. Whiskey is in a similar category to vodka as most bottles are around 40% ABV or 80 proof.
The rule of thumb is that liquor becomes flammable over 100 proof, which is 50% alcohol. However, 80 proof (40%) liquor may sputter and smoke a bit. The temperature also plays a major factor in the flammability of alcohol. A liquor that does not have enough alcohol to burn at room temperature may burn when heated.
The original British definition of "proof" was related to the combustibility of a beverage. In the 18th century, a beverage was deemed 100 proof if a small pellet of gunpowder soaked in the beverage could be ignited. This corresponds to around 57% alcohol. The definition of proof has since been adjusted so that 100 proof is defined as 50% alcohol.
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Temperature is a factor
The flammability of alcohol depends on its proof, which is related to its alcohol content. In the United States, proof is defined as twice the percentage of ABV (alcohol by volume). Therefore, an alcohol with 40% ABV is considered 80 proof.
The threshold for flammability also depends on the definition of "proof." Historically, 100 proof was considered the threshold for flammability, corresponding to around 57% ABV. However, the definition of proof has since been adjusted, and today, 100 proof is defined as 50% ABV. At this concentration, alcohol will burn if mixed sufficiently with air but will not ignite gunpowder. Liquors above 100 proof (i.e., over 50% ABV) will ignite instantly and are more resistant to extinguishing.
Today, the general consensus is that alcohol becomes flammable at concentrations above 80 proof (40% ABV). At this concentration, alcohol may sputter and smoke, but it will not produce a steady flame. A sustained flame is more likely to be achieved with alcohol concentrations above 100 proof (50% ABV).
In summary, while alcohol content is a critical factor in flammability, temperature also plays a significant role. Lower-proof alcohols may ignite at higher temperatures, while higher-proof alcohols will burn more readily and intensely.
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Frequently asked questions
The contemporary definition for proof is based on the percentage of alcohol by volume (% ABV). It is twice the ABV value.
Alcohol with a proof of 80 or 40% ABV will catch fire. However, sources suggest that a proof of 100 or 50% ABV is required for a steady flame.
Flambéing is a cooking method that involves flaming alcohol. Common alcoholic drinks used for flambéing include whiskey, vodka, and Grand Marnier.
The temperature and the presence of other ingredients can influence the flammability of alcohol. For example, sugar in Sambuca may contribute to its ignition.
Flambéing and flaming drinks can be dangerous and should be approached with caution. It is important to maintain a safe distance from flammable liquids and to avoid reckless handling to prevent accidents and injuries.
