[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-detail-155220-en":3,"doc-seo-155220-105":29,"detail-sidebar-cat-0-en-105":89},{"code":4,"msg":5,"data":6},0,"success",{"doc_id":7,"user_id":8,"nickname":9,"user_avatar":10,"doc_module":4,"category_id":11,"category_name":12,"doc_title":13,"doc_description":14,"doc_content":15,"file_id":16,"file_url":17,"file_type":18,"file_size":19,"view_count":20,"is_deleted":4,"is_public":20,"is_downloadable":20,"audit_status":20,"page_count":11,"language":21,"language_code":22,"site_id":23,"html_lang":22,"table_of_contents":24,"faqs":25,"seo_title":26,"seo_description":14,"update_tm":27,"read_time":28},155220,687197100911,"Himbo","https://ap-avatar.wpscdn.com/avatar/a000239b6f1da00475?x-image-process=image/resize,m_fixed,w_180,h_180&k=1785132997149421697",2,"Literature","Petrichor: A Scent of Rocks and Rain - Outside Story","Petrichor describes the distinctive smell that appears when rain first soaks the ground, often associated with sun-warmed rocks after wetting breaks a dry spell. The text traces its discovery from ancient observations to a 1964 chemical study that isolates the role of organic matter and later explains how aerosolization during light rain can lift scent-carrying particles and molecules into the air. It also links rock scent to metabolic, respiration, and decomposition processes.","The Outside Story  \nPetrichor: A Scent of Rocks and Rain By Rachel Sargent Mirus  \nWhen I hug my son after a day offall bouldering, his hair smells of the sun-warmed rock we’ve been climbing over. It’s a distinctive odor, evocative of gray ledges and golden light returning after rain, and yet it’s not the rock I’m smelling, but tell-tale traces of life.  \nPeople have written about – and appreciated – that odor since ancient times. Two thousand years ago, the Roman scholar Pliny described the scent that occurred after a drought, when rain first soaked the ground: “Then it is that the earth exhales this divine odor, that is so peculiarly its own, and to which, imparted to it by the sun, there is no perfume, however sweet, that can possibly be compared.”  \nIn 1964, Australian chemists Isabel Joy Bear and Richard Grenfell Thomas published a research article describing the origins of this scent and giving it a name: “petrichor.”(In Ancient Greek, petr refers to rock, and ichor is the “tenuous essence” that runs through the veins of the gods. ) Although this name implies that petrichor is essential to the rock itself, Bear and Thomas’s own research contradicts that implication.  \nBear and Thomas conducted several experiments to isolate the source of petrichor within rocks. They sterilized rocks with a variety of mineral compositions, wetted them down to verify that they were scentless, and left them in an open location that was sheltered from rain. After a variety of time intervals, they again wetted the samples and assessed them for scent. They observed that over time, many rocks, but especially those dominated by silica or iron oxide, developed scent again, producing a classic petrichor aroma.  \nThis research strongly suggested that petrichor arose not from the rocks themselves, but from organic material settling out of the atmosphere and sticking onto the rocks’ surface, which moisture later revived with a gust of scent. By steaming silicate-rich rocks, Bear and Thomas were able to extract oil  \nwith intense petrichor – a method, they noted, that is similar to a steam distillation process used by Indian perfumers, to produce a scent called matti kar attar or “earth perfume.” Chemical analysis of this oil showed it to be “organic in nature.”  \nSince this research, other scientists have confirmed that rock scent arises from the chemical processes of metabolism, respiration, and decomposition that occur around us, all the time. Mixed with these leftover chemicals are other scents, which can give a particular place a unique smell (and become a component of petrichor) . These include volatile oils from plants, compounds released by bacteria and fungi, and molecules from inorganic reactions such as ozone that forms in the atmosphere during lightning strikes. While the exact source and chemical composition of this scent may vary, the collective effect is a recognizable “smell of rock.”  \nAs Bear and Thomas demonstrated, a close-up sniff of dampened rocks reveals this scent. But how does it rise up in the air, all the way to our noses? And what does rain have to do with it?  \nIn 2015, mechanical engineers Young Soo Joung and Cullen R. Buie identified a three-step process by which a raindrop can produce mist. When a water drop hits the soil surface, air is trapped, forming a bubble. As the raindrop continues to collapse onto the soil, the first bubble breaks into smaller bubbles, which rise toward the drop surface. They burst from the surface of the raindrop, releasing minute jets of water that become a fine mist. Joung and Buie confirmed that the most likely condition for this aerosolization process to occur is when light rain falls on dry sandy-clay to clay-type (silica rich) soils.  \nIn order to determine whether this aerosolization process could also carry surface residue up into the air, Joung and Buie conducted a second experiment. They added dye to soil samples, exposed the soil to water drops, and suspended a piece of glass above where th","cbCaim79CrW3Ofyg","https://ap.wps.com/l/cbCaim79CrW3Ofyg","pdf",328283,1,"English","en",105,"# Petrichor’s origin and meaning\n## Ancient and scientific discovery\n## Experiments on rocks and organic compounds\n## How raindrops carry scent into the air","[{\"question\":\"What is petrichor, and when does it occur?\",\"answer\":\"Petrichor is the recognizable smell of rocks after rain, especially when dampening dry ground. It is described as occurring when rain first soaks soil and revives the characteristic odor.\"},{\"question\":\"Where does petrichor come from according to the research cited?\",\"answer\":\"Bear and Thomas’s findings suggest the scent comes not from rocks alone, but from organic material that settles onto rock surfaces and is later revived by moisture. Chemical analysis of extracted oil is described as organic in nature.\"},{\"question\":\"How can a raindrop spread petrichor to human noses?\",\"answer\":\"A three-step process traps air when drops hit soil, forms smaller bubbles, and releases minute water jets that create fine mist. When light rain falls on dry silica-rich soils, this mist can carry scent molecules off surfaces into the air.\"}]","Petrichor: A Scent of Rocks and Rain - Outside Story | PDF",1787907991,3,{"code":4,"msg":30,"data":31},"ok",{"site_id":23,"language":22,"slug":32,"title":13,"keywords":33,"description":14,"schema_data":34,"social_meta":84,"head_meta":86,"extra_data":88,"updated_unix":27},"petrichor-a-scent-of-rocks-and-rain-outside-story","",{"@graph":35,"@context":83},[36,51,66],{"@type":37,"itemListElement":38},"BreadcrumbList",[39,43,46,48],{"item":40,"name":41,"@type":42,"position":20},"https://docshare.wps.com","Home","ListItem",{"item":44,"name":45,"@type":42,"position":11},"https://docshare.wps.com/document/","Document",{"item":47,"name":12,"@type":42,"position":28},"https://docshare.wps.com/document/literature/",{"item":49,"name":13,"@type":42,"position":50},"https://docshare.wps.com/document/petrichor-a-scent-of-rocks-and-rain-outside-story/155220/",4,{"url":49,"name":13,"@type":52,"author":53,"headline":13,"publisher":55,"fileFormat":58,"inLanguage":22,"description":14,"dateModified":59,"datePublished":60,"encodingFormat":58,"isAccessibleForFree":61,"interactionStatistic":62},"DigitalDocument",{"name":9,"@type":54},"Person",{"url":40,"name":56,"@type":57},"DocShare","Organization","application/pdf","2026-09-05","2026-08-28",true,{"@type":63,"interactionType":64,"userInteractionCount":20},"InteractionCounter",{"@type":65},"ViewAction",{"@type":67,"mainEntity":68},"FAQPage",[69,75,79],{"name":70,"@type":71,"acceptedAnswer":72},"What is petrichor, and when does it occur?","Question",{"text":73,"@type":74},"Petrichor is the recognizable smell of rocks after rain, especially when dampening dry ground. It is described as occurring when rain first soaks soil and revives the characteristic odor.","Answer",{"name":76,"@type":71,"acceptedAnswer":77},"Where does petrichor come from according to the research cited?",{"text":78,"@type":74},"Bear and Thomas’s findings suggest the scent comes not from rocks alone, but from organic material that settles onto rock surfaces and is later revived by moisture. Chemical analysis of extracted oil is described as organic in nature.",{"name":80,"@type":71,"acceptedAnswer":81},"How can a raindrop spread petrichor to human noses?",{"text":82,"@type":74},"A three-step process traps air when drops hit soil, forms smaller bubbles, and releases minute water jets that create fine mist. When light rain falls on dry silica-rich soils, this mist can carry scent molecules off surfaces into the air.","https://schema.org",{"og:url":49,"og:type":85,"og:title":13,"og:site_name":56,"og:description":14},"article",{"robots":87,"canonical":49},"index,follow",{"doc_id":7,"site_id":23},{"code":4,"msg":5,"data":90},[91,95,98,102,107,112,117,122,127,130,134],{"id":20,"doc_module":4,"doc_module_name":45,"category_name":92,"show_sort_weight":93,"slug":94},"Story & Novel",90,"story-novel",{"id":11,"doc_module":4,"doc_module_name":45,"category_name":12,"show_sort_weight":96,"slug":97},80,"literature",{"id":50,"doc_module":4,"doc_module_name":45,"category_name":99,"show_sort_weight":100,"slug":101},"Exam",70,"exam",{"id":103,"doc_module":4,"doc_module_name":45,"category_name":104,"show_sort_weight":105,"slug":106},5,"Comic",60,"comic",{"id":108,"doc_module":4,"doc_module_name":45,"category_name":109,"show_sort_weight":110,"slug":111},6,"Technology",50,"technology",{"id":113,"doc_module":4,"doc_module_name":45,"category_name":114,"show_sort_weight":115,"slug":116},7,"Healthcare",40,"healthcare",{"id":118,"doc_module":4,"doc_module_name":45,"category_name":119,"show_sort_weight":120,"slug":121},8,"Research & Report",30,"research-report",{"id":123,"doc_module":4,"doc_module_name":45,"category_name":124,"show_sort_weight":125,"slug":126},9,"Religion & Spirituality",20,"religion-spirituality",{"id":125,"doc_module":4,"doc_module_name":45,"category_name":128,"show_sort_weight":125,"slug":129},"World Cup","world-cup",{"id":131,"doc_module":4,"doc_module_name":45,"category_name":132,"show_sort_weight":131,"slug":133},10,"Lifestyle","lifestyle",{"id":135,"doc_module":4,"doc_module_name":45,"category_name":136,"show_sort_weight":103,"slug":137},19,"General","general"]