Buzz
Fire has been a fundamental force in human civilization since the dawn of time. It provides us with warmth and drives our industries, but it can also become a destructive force when it spreads uncontrollably.
In the U.S. alone, approximately 3,500 people lose their lives to fires each year. Almost everyone has encountered fire in one form or another, whether for good or ill. Yet, despite our deep familiarity with it, fire still has the power to astonish us with its many mysteries.
These 10 fire-related facts, spanning science and culture, will ignite your curiosity and fuel your mind.
10. Fire Forms a Sphere in Zero Gravity
On Earth, gravity causes a candle flame to take the shape of a teardrop. This is due to air buoyancy, which varies with temperature—hotter air rises, pulling cooler air behind it, shaping the flame.
On Earth, this same principle leads heavier materials to sink to the bottom of a lake, forming sediment. Oil rises to the top of water for the same reason. However, in microgravity aboard the International Space Station, oil doesn’t separate from water, and sediment remains evenly distributed in the water. Similarly, heated air from a candle flame stays stationary rather than rising.
In space, instead of the typical teardrop shape, a candle flame forms a constant, bright blue sphere. Unlike on Earth, there are no visible flames (though they might be present in small form), and the fire takes on a uniform spherical shape.
In space, unlike fires on Earth, oxygen comes to the flames instead of the flames reaching out in flickering directions to find it. The unique properties of microgravity allow fires to burn at much cooler temperatures for extended periods compared to Earth.
While a typical candle flame on Earth burns between 1500 and 2000 kelvins, in microgravity, the same candle can burn at just 500 to 800 kelvins. These cooler flames do not produce soot, CO2, or water. If this phenomenon were replicated on Earth, it could lead to more fuel-efficient automobile engine starts.
9. Forest Fires Generate Their Own Weather
Massive forest fires can span millions of acres. The largest on record occurred in Russia, consuming 47 million acres of land. When fires reach such enormous sizes, they begin to influence the surrounding atmosphere, creating a massive upward movement of air due to the heat.
According to meteorologist Evan Duffey, the fire pushes air upward, and once it starts rising, atmospheric instability accelerates its ascent, much like a thunderstorm developing.
As the hot air continues to rise, it cools, and water droplets form within it, leading to cloud formation and possibly even thunderstorms. Clouds generated by a forest fire are called pyrocumulus, and the fire-induced storm cloud is referred to as a pyrocumulonimbus.
While storms triggered by fires can assist firefighting by bringing rain, they can also complicate the situation by creating strong winds that fan the flames. In some cases, these powerful gusts can even lead to tornadoes, such as the one caused by the Carr Fire in California in 2018.
8. The Deadliest Forest Fire Remains Relatively Unrecognized
The year 1871 was disastrous for fires in the United States. Between October 8th and 10th, a massive fire tore through Chicago, causing $200 million in damages and claiming 300 lives. The destruction led to widespread looting and lawlessness, resulting in the declaration of martial law, which remained in effect for several weeks.
The Great Chicago Fire garnered widespread media attention and sparked a significant economic boom in the city during its reconstruction. Following the fire, fire safety became a central issue that even politicians used in their campaigns.
Although the Great Chicago Fire was devastating, it was relatively small compared to another fire that occurred on the same day. On October 8, a fire ignited in Wisconsin’s drought-stricken farmland, eventually spreading over an estimated 1.2 million acres.
This fire became known as the Peshtigo Fire, after the nearby town that was ravaged by the flames. It claimed an estimated 1,200 to 1,500 lives, at least four times the number of fatalities in the Great Chicago Fire that day.
Debra Anderson, an archivist at the University of Wisconsin–Green Bay Area Research Center, noted, “What most researchers find so fascinating is the profound impact the Peshtigo Fire had on people's lives. It was so horrific that some thought it was the end of the world.”
Although the Chicago Fire garnered most of the media attention and is more commonly remembered, it was the Peshtigo Fire that completely obliterated entire towns, erasing them from existence.
7. Fire as a Form of Art
Artist Steven Spazuk was inspired by a dream to use fire as a tool for creating art. His initial attempt left his canvas scorched and ruined, but he was undeterred.
Spazuk refined his technique by using a more fire-resistant canvas. He experimented with various unconventional brushes and eventually discovered the perfect varnish and sealer to protect his delicate artworks. At last, his dream came true: fumage, or fire art.
Spazuk’s process starts with using a flame to apply soot to a white cardboard canvas. He explains, “The flame always reacts to the air displacement, so I can’t control it. However, I can guide my lighter and the flame to create more or less the shape I want. Sometimes, I just let the flame do the work and create these magical forms.”
The soot created in the process is then molded into a visual representation. The final image emerges from the natural patterns formed by the flame, and Spazuk employs a range of unconventional tools. Feathers and frayed ropes are part of his toolkit, and he even crafted a brush from his wife’s hair, which she lost during chemotherapy, to paint her portrait.
Spazuk shared his thoughts on his unique medium:
Fire serves as a powerful metaphor for humanity. Like fire, we possess immense power, warmth, and energy, but we are also capable of destruction. [ . . . ] Creating art with fire allows me to capture infinite moments, and it brings me joy. The flame itself represents history—an uncontrollable and unpredictable force that has captivated humans for centuries. The process is mesmerizing! Each flicker of flame or brushstroke carries its own story.
6. Fire as the Center of Zoroastrian Worship
There are approximately 100,000–200,000 followers of Zoroastrianism around the world, including in Iran and India. For these practitioners, fire symbolizes the spiritual virtues within an individual, such as order, benevolence, honesty, fairness, and justice. These collective virtues are referred to as asha.
During their prayers, Zoroastrians face a source of light, which may be the Sun, a wood fire, an oil lamp, or even one of the eternal flames maintained in their fire temples.
These sacred fires are fueled with pure materials to represent the asha within a person. Just as an individual remains virtuous by focusing on positive thoughts, the fire stays pure when it is supplied with clean and pure fuels.
Zoroastrianism teaches that five types of fire exist throughout creation. These fires can be found in inanimate objects, living beings, plants, clouds, and flames, all believed to be remnants of the original fire that the Zoroastrians believe created the universe.
Although fire is central to Zoroastrianism, they do not worship the fire itself, as is commonly assumed. Instead, they view fire as a symbolic tool used by God to create and sustain the universe and all life within it.
5. Fire Isn’t Always Orange
The majority of common fires, like campfires, burn at temperatures ranging from 590 to 1,200 degrees Celsius (1,100–2,200 °F), which creates an orange flame. At these temperatures, some of the carbon in the fuel escapes without burning. These unburned particles blend with the fire and, illuminated by its light, give the fire its characteristic yellow or orange hue.
This effect changes as the fire's temperature rises. Once the temperature reaches 1,260–1,650 degrees Celsius (2,300–3,000 °F), the fire becomes hot enough to completely burn off the carbon. Without any leftover carbon particles to alter the color, these hotter fires—such as those from a propane stove—burn with a bright blue flame.
However, carbon isn’t the only element that can influence a fire’s color. If the fuel contains small amounts of copper, the copper particles released into the fire will produce a green light, much like carbon particles produce an orange hue.
When burned, lithium chloride produces a pink flame, strontium chloride burns with a red hue, and potassium chloride creates a purple flame. Depending on the type of fuel used, a wide spectrum of colors can be achieved, creating a veritable rainbow of fire.
4. Fire Can Be Sparked by Ice
Fire and ice are often seen as opposites, and rightfully so. Few things could be more extreme on the temperature scale. However, resourceful survivalists have found ways to use one to ignite the other.
As strange as it may sound, ice can be the key to warmth if you’re stranded in winter. The technique involves carving a roughly circular piece of ice with a knife and then polishing it with the heat from your hands. Over time, the ice disk can be shaped into a lens, similar to a magnifying glass, which can then be used to focus light and start a fire.
Once shaped, the ice lens can focus sunlight into a narrow beam that gradually heats dry tinder, which can then be coaxed into a fire. While this technique demands patience and precision, it serves as an ingenious way to start a fire using one of the most readily available—though unexpected—resources when stranded in winter.
3. Fire as a Healing Agent
Traditional Chinese medicine, a booming industry valued at about $84 billion in 2012, incorporates practices like acupuncture, suction cups, and exotic ingredients such as caterpillar fungus and dried gecko. However, one treatment that has been gaining popularity is 'fire therapy.'
Fire therapy is believed to alleviate a range of chronic conditions, reduce wrinkles, and revitalize one's energy. Rooted in Chinese folklore, the concept suggests that good health arises from maintaining a balance between the 'hot' and 'cold' elements within the body.
The method involves applying an herbal paste, using a towel soaked in alcohol, and igniting a controlled flame at strategic pressure points on the body. Zhang Fenghao, a leading fire therapist in China, declared, 'Medicine needs a revolution. Fire therapy for the world is the solution.'
At present, fire therapy has not received formal recognition from medical journals, nor is there substantial scientific proof to validate its purported health benefits. Furthermore, it carries potential risks.
2. Flamethrowers Have Been Around Since Ancient Times
Fire has long been weaponized in warfare. The deliberate use of fire against enemies dates back at least to 3500 BC, when northern and southern Mesopotamian civilizations were in conflict. During this time, a settlement was set on fire and assaulted with sling bullets.
While we often associate the advanced use of fire with modern warfare, it wasn't until 1901 that flamethrowers were introduced to the German army and deployed during World War I. However, the truth is that flamethrowers, devices designed to project burning liquids over long distances, have been in use since ancient times, and were quite sophisticated even back then.
During the rule of Byzantine Emperor Constantine IV, between AD 668 and 685, a Greek-speaking inventor named Callinicus of Heliopolis created what would later be known as 'Greek fire.' This handheld weapon was capable of firing a special incendiary compound and played a crucial role in defending the Byzantine Empire for centuries.
In fact, Emperor Romanos II, who reigned as senior emperor from AD 959–963, listed Greek fire as one of three items that must never fall into foreign hands. The other two items were the Byzantine imperial regalia and any royal princess.
Initially, Greek fire was mainly used in naval warfare to set enemy ships ablaze, as the compound couldn't be extinguished by water. It was even said to burn better in water. Over time, it was also utilized during sieges with portable pumps, which could be used in both offense and defense of cities.
Liutprand of Cremona, a diplomat and historian who lived during the time Greek fire was in use, described the effect of the weapon by stating, 'The Greeks began to fling their fire all around; and the Rusii, seeing the flames, threw themselves in haste from their ships, preferring to be drowned in the water rather than burned alive in the fire.'
1. The Eucalyptus Tree Thrives in Fire
On average, 67,000 forest fires blaze across the globe every year, consuming an estimated seven million acres of land. These destructive fires leave little behind, wiping out entire ecosystems and forests in their wake.
Fire is one of the most formidable natural threats to forests. However, there is one tree that not only withstands fires but actually encourages them: the eucalyptus tree of Australia. Depending on the species, it can reach heights of 18–55 meters (60—180 ft) and is perfectly adapted to fire.
The fallen leaves of the eucalyptus create a highly flammable carpet on the forest floor, while the bark peels away in long strips that extend down to the ground. This makes it easy for fire to ascend into the branches.
Crown fires, which burn through the treetop canopy, are a frequent occurrence in eucalyptus forests. The tree’s fragrant oil, which is highly flammable, has earned the species the nickname 'gasoline tree.'
Why would a tree evolve in such a way that fire seems to benefit it? The eucalyptus tree’s seed capsules are perfectly designed to burst open when exposed to fire, and the resulting seeds thrive in the nutrient-rich ash left behind.
"Torch a hillside thoroughly, and the eucalyptus will take over completely," remarked David Bowman, a forest ecologist from the University of Tasmania. "They grow rapidly in their first few years and outcompete everything around them."
The eucalyptus tree's affinity for fire has caused significant concern in Australia, where the tree has fueled many intense fires. However, its fire-loving nature has spread across every inhabited continent, bringing new fire risks worldwide.
"What on earth have we done?" Bowman questioned. "We've spread a dangerous plant across the globe."
