Heidi Norton
The scent of rain is a unique and beloved fragrance that humans have sought to capture in bottled perfumes for centuries. Known as petrichor, the smell of rain is derived from various natural compounds, including geosmin, a metabolite produced by bacteria in the soil, as well as terpenes and other volatile organic compounds. The specific scent of rain can vary depending on the local environment, such as the type of rocks and plant species present. In Kannauj, India, perfumers have been creating a unique fragrance called mitti attar, which captures the scent of the monsoon rains and the baked, parched earth that follows. Outside of Kannauj, modern perfumers have also crafted fragrances that evoke the serenity and peace that comes after rainfall, featuring notes of musk, lavender, and sandalwood.
| Characteristics | Values |
|---|---|
| Term | Petrichor |
| Origin | Coined in a paper published in Nature, The Nature of Argillaceous Odour, in 1964 |
| Etymology | Derived from the Greek "Petra" (stone) and "ichor" (eternal essence or blood of gods) |
| Definition | The smell released when rocks and clay are left in warm air and then moistened in the absence of microorganisms |
| Common Components | Geosmin, terpenes, volatile organic compounds |
| Local Variation | The smell of rain varies based on the local environment, including the abundance and type of rocks and plant species |
| Cultural Significance | Mitti attar, a scent capturing the fragrance of rain-soaked earth, is produced in Kannauj, India, using a centuries-old technique |
| Perfumes | Cloud Collection No.2 by Zarkoperfume, White Moss by Acca Kappa, In The Rain by Floraïku, Commodity Rain, Rain by Demeter Fragrance Library |
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What You'll Learn
The science of petrichor
The term "petrichor" was first used to refer to the scent of rain in a 1964 paper by Australian researchers Isabel Bear and Dick Thomas, published in the journal Nature. The word is derived from the Greek "petra" (stone) and "ichor" (the fluid that flows in the veins of the gods in Greek mythology).
Petrichor is the earthy scent produced when rain falls on dry soil. It is a combination of plant oils, bacteria, and geosmin, a compound released by certain soil-dwelling bacteria. When raindrops hit the ground, they disturb these aromatic compounds, causing them to be released into the air. The scent of petrichor is often described as earthy, fresh, and pleasant. It is a reminder of the beauty and power of nature and a symbol of hope and renewal.
The phenomenon of petrichor occurs when raindrops interact with various elements in the environment. The specific scent of petrichor can depend on the local environment, including the abundance and type of rocks and plant species present. When a raindrop lands on a porous surface, air from the pores forms small bubbles, which float to the surface and release aerosols. These aerosols carry the scent, as well as bacteria and viruses, into the air. Raindrops that fall at slower speeds tend to produce more aerosols, which is why petrichor is more common after light rains.
Geosmin is a key component of the scent of petrichor. It is a metabolite naturally produced by some bacteria found in the soil. Humans are extremely sensitive to geosmin and can detect it at concentrations as low as 0.4 parts per billion. In addition to petrichor, geosmin is also responsible for the smell of beetroot, some fish, soil, and spoiled food. Terpenes and other volatile organic compounds in the atmosphere also contribute to the scent of rain.
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Geosmin and other volatile organic compounds
The distinctive scent of rain, known as petrichor, is largely due to the presence of geosmin, a volatile organic compound (VOC) produced by bacteria found in soil and aquatic environments. Geosmin is a metabolite, which means it is naturally produced by bacteria. It has an earthy, musty odour and is responsible for the scent of rain-soaked earth.
Geosmin is highly detectable by humans, with an odour detection threshold of 0.4 parts per billion. This means that even in a room with just one molecule of geosmin for every 1,000,000,000 molecules of air, it would still be perceptible to the human sense of smell.
In addition to geosmin, other volatile organic compounds (VOCs) are also important contributors to the smell of rain. These include terpenes, which are already present in the atmosphere, and other compounds such as indole, 2-phenylethanol, and dimethyl disulfide, which are emitted by bacteria.
The perception of the smell of rain is highly dependent on the local environment, including the abundance and type of rocks and plant species present. When rain drops land, they instantly dissolve the chemicals adsorbed on the dry rock or soil surface. Air bubbles become trapped under the droplets and rise to the surface, bursting and releasing a fine mist that becomes suspended in the atmosphere as aerosols. These aerosols act as floating carriers of dissolved smells, quickly evaporating and releasing the scent molecules into the air.
The exact biological function of geosmin is still not fully understood by scientists, despite it being a common compound in our everyday lives. However, it is hypothesized that the human attraction to the scent of rain may be due to its association with bounty, abundance, and the end of drought.
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Mitti attar, the Indian fragrance
Mitti attar, also known as Petrichor Oil, is a fragrance that captures the scent of rain-soaked earth. The name "mitti attar" roughly translates to "the smell of rain-soaked earth" in English, with mitti meaning "earth" and attar referring to scented oils made from natural ingredients. This unique fragrance has been crafted by generations of perfumers in Kannauj, a town in the north Indian state of Uttar Pradesh.
The process of creating mitti attar involves extracting the essence from parched clay, capturing the scent of the earth just before the arrival of the monsoon rains. This extraction is done through a traditional attar hydro-distillation technique called Deg & Bhapka, which has been used for centuries. In this method, a cow-dung fire is lit beneath a cauldron containing clay pots, and the vapour travels through bamboo pipes to condense in receivers (bhapka) over a base of oil, forming the attar.
The fragrance of mitti attar is delicate and unique, offering an olfactory experience akin to the first drops of rain falling on parched earth. Its scent is said to evoke the enticing aroma of baked, parched earth when the monsoon rains arrive after a long drought. This particular fragrance is believed to be beloved by human beings due to its association with bounty, abundance, and the end of drought.
The term "petrichor," often used to describe the scent of rain, was coined in a 1964 paper published in Nature, titled "The Nature of Argillaceous Odour." It is derived from the Greek words "petra," meaning stone, and "ichor," meaning eternal essence. The paper aimed to distinguish the smells inherent to rocks and clay from those produced by microorganisms.
Mitti attar has become a renowned fragrance, with perfumeries like Meena Perfumery in Kannauj bottling and selling this enigmatic scent. The art of capturing the fragrance of mitti attar has been passed down through generations, and it continues to captivate those who encounter its unique and alluring aroma.
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Perfumes that smell like rain
The scent of rain, known as petrichor, is a smell that humans generally love. The term "petrichor" comes from the Greek "petra", meaning stone, and "ichor", meaning the blood of the gods or eternal essence. Petrichor is released when raindrops fall on porous earth, releasing chemical compounds from the ground into the air. The scent of rain varies depending on the local environment, including the abundance and type of rocks and plant species in the area.
There are several perfumes that attempt to capture the scent of rain. One example is Demeter Thunderstorm, a perfume that is said to be a dead-on dupe for the scent of an impending storm. Solstice Scents' "During the Rain" is another perfume that is meant to evoke the scent of rain. For those looking for a more affordable option, Clean Reserve Rain is an option that is supposed to smell like rain. Chiseled Face's Summer Storm shaving soap is also said to smell like rain, with notes of soil, wet grass, and light flowers.
In Kannauj, India, generations of perfumers have been making a unique scent that captures the smell of the monsoon rains called mitti attar. Mitti means "earth" in Sanskrit, and mitti attar loosely translates to the smell of rain-soaked earth. The fragrance is made using a special, centuries-old technique that involves using clay materials to capture the scent.
While there is no single accepted definition of what rain smells like, there are a few key ingredients that are commonly associated with the scent. These include geosmin, a metabolite produced by bacteria found in the soil, and ozone, which is released before rainfall and is responsible for the sharp, clean smell that is often associated with lightning.
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How rain scent varies by environment
The scent of rain differs based on the environment, and the unique smell of rain in a particular location is influenced by the local surroundings. The type and abundance of rocks and plant species in an area can significantly impact the scent of rain. For example, the smell of rain in a pine forest will differ from that of a rainforest due to variations in the acidity of the forest floor. Similarly, the odours released by an asphalt-covered urban area will vary from those of a desert gulch. The unique smell of rain in a desert region is attributed to the build-up of oils and geosmin in the soil during prolonged dry periods.
The scent of rain is also influenced by the intensity of rainfall. Torrential downpours may not be associated with distinct smells, while light to moderate rainfall produces more aerosols, resulting in a more noticeable scent. When raindrops fall, they dissolve the chemicals on dry surfaces, releasing a burst of odours into the air. This process is enhanced during light rain, creating a subtle chemical reaction that diffuses various scents into the atmosphere.
The term "petrichor" describes the earthy scent produced when rain interacts with dry soil. Coined by scientists Isabel Joy Bear and Richard Grenfell Thomas in 1964, it is derived from the Greek words "petra" (stone) and "ichor" (eternal essence or the blood of mythological gods). Petrichor is composed of several compounds, with geosmin being the most well-known. Geosmin is produced by bacteria found in the soil, and humans are highly sensitive to its scent, even at low concentrations.
In addition to geosmin, terpenes and other volatile organic compounds present in the atmosphere contribute to the overall scent of rain. These compounds are released from plants during dry periods and are then liberated into the air when it rains, adding to the earthy aroma of petrichor. Summertime humidity and individual memories also play a role in shaping our perception of the sharp, fresh odour associated with rainstorms.
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Frequently asked questions
The term "petrichor" was coined in a 1964 paper published in Nature, The Nature of Argillaceous Odour, to describe the scent of rain. It is derived from the Greek "petra" (stone) and "ichor" (eternal essence).
Geosmin, a metabolite naturally produced by some bacteria found in the soil, is possibly the most famous component of the scent of rain. Humans are extremely sensitive to it and can detect it at a concentration of 0.4 parts per billion. Terpenes and other volatile organic compounds already present in the atmosphere also contribute to the scent.
In Kannauj, India, perfumers have been making a unique scent that captures the smell of the monsoon rains called mitti attar. Mitti means "earth" in Hindi, and mitti attar loosely translates to the smell of rain-soaked earth. The fragrance is made using a centuries-old technique that involves crushing clay materials such as kulhads (clay cups) that have been baked and infused with the scent of the monsoon rains.
