Dirt is an unclean matter, especially when in contact with a person's clothes, skin, or possessions. In such cases, they are said to become dirty. Common types of dirt include: *

Debris Debris (, ) is rubble, wreckage, ruins, litter and discarded garbage/refuse/trash, scattered remains of something destroyed, or, as in geology, large rock fragments left by a melting glacier, etc. Depending on context, ''debris'' can refer to ...

: scattered pieces of waste or remains *

Dust Dust is made of fine particles of solid matter. On Earth, it generally consists of particles in the atmosphere that come from various sources such as soil lifted by wind (an aeolian process), volcanic eruptions, and pollution. Dust in ho ...

: a general powder of organic or mineral matter *

Filth Filth or The Filth may refer to: Common uses * Dirt, unclean matter * Police officer, a pejorative in British slang Arts, entertainment, and media Films * ''Filth'' (film), a 2013 film based on the novel * ''Filth'', an alternative title for ''S ...

: foul matter such as

excrement Feces ( or faeces), known colloquially and in slang as poo and poop, are the solid or semi-solid remains of food that was not digested in the small intestine, and has been broken down by bacteria in the large intestine. Feces contain a relat ...

Grime Grime may refer to: * Dirt, in the form of black, ingrained dust * Grime (music genre), a genre of music * ''Grime'' (album), a 2001 album by Iniquity * ''Grime'' (video game), a 2021 Metroidvania video game * "Grime", a 2022 song by Dallas Woo ...

: a black, ingrained dust such as

soot Soot ( ) is a mass of impure carbon particles resulting from the incomplete combustion of hydrocarbons. It is more properly restricted to the product of the gas-phase combustion process but is commonly extended to include the residual pyrolysed ...

Soil Soil, also commonly referred to as earth or dirt Dirt is an unclean matter, especially when in contact with a person's clothes, skin, or possessions. In such cases, they are said to become dirty. Common types of dirt include: * Debri ...

: the mix of

clay Clay is a type of fine-grained natural soil material containing clay minerals (hydrous aluminium phyllosilicates, e.g. kaolin, Al2 Si2 O5( OH)4). Clays develop plasticity when wet, due to a molecular film of water surrounding the clay par ...

sand Sand is a granular material composed of finely divided mineral particles. Sand has various compositions but is defined by its grain size. Sand grains are smaller than gravel and coarser than silt. Sand can also refer to a textural class o ...

, and humus which lies on top of bedrock. The term 'soil' may be used to refer to unwanted substances or dirt that are deposited onto surfaces such as clothing.

Exhibitions and studies

A season of artworks and exhibits on the theme of dirt was sponsored by the

Wellcome Trust The Wellcome Trust is a charitable foundation focused on health research based in London, in the United Kingdom. It was established in 1936 with legacies from the pharmaceutical magnate Henry Wellcome (founder of one of the predecessors of Glaxo ...

in 2011. The centrepiece was an exhibition at the

Wellcome Collection Wellcome Collection is a museum and library based at 183 Euston Road, London, displaying a mixture of medical artefacts and original artworks exploring "ideas about the connections between medicine, life and art". Founded in 2007, the Wellcome C ...

showing pictures and histories of notable dirt such as the great dust heaps at Euston and King's Cross in the 19th century and the Fresh Kills landfill which was once the world's largest landfill.

Cleaning

When things are dirty, they are usually cleaned with solutions like hard surface cleaner and other chemical solutions; much domestic activity is for this purpose—washing, sweeping, and so forth. In a commercial setting, a dirty appearance gives a bad impression. An example of such a place is a restaurant. The dirt in such cases may be classified as temporary, permanent, and deliberate. Temporary dirt is streaks and detritus that may be removed by ordinary daily cleaning. Permanent dirt is ingrained stains or physical damage to an object, which requires major renovation to remove. Deliberate dirt is that which results from design decisions such as decor in dirty orange or grunge styling.

Disposal

As cities developed, arrangements were made for the disposal of trash through the use of waste management services. In the United Kingdom, the Public Health Act 1875 required households to place their refuse into a container that could be moved so that it could be carted away. This was the first legal creation of the dustbin.

Health

Modern society is now thought to be more hygienic. Lack of contact with

microorganism A microorganism, or microbe,, ''mikros'', "small") and ''organism'' from the el, ὀργανισμός, ''organismós'', "organism"). It is usually written as a single word but is sometimes hyphenated (''micro-organism''), especially in olde ...

s in dirt when growing up is hypothesised to be the cause of the epidemic of

allergies Allergies, also known as allergic diseases, refer a number of conditions caused by the hypersensitivity of the immune system to typically harmless substances in the environment. These diseases include hay fever, food allergies, atopic dermat ...

such as

asthma Asthma is a long-term inflammatory disease of the airways of the lungs. It is characterized by variable and recurring symptoms, reversible airflow obstruction, and easily triggered bronchospasms. Symptoms include episodes of wheezing, co ...

. The human

immune system The immune system is a network of biological processes that protects an organism from diseases. It detects and responds to a wide variety of pathogens, from viruses to parasitic worms, as well as cancer cells and objects such as wood splint ...

requires activation and exercise in order to function properly and exposure to dirt may achieve this. For example, the presence of staphylococcus bacteria on the surface of the skin regulates the

inflammation Inflammation (from la, inflammatio) is part of the complex biological response of body tissues to harmful stimuli, such as pathogens, damaged cells, or irritants, and is a protective response involving immune cells, blood vessels, and molec ...

which results from injury. Even when no visible dirt is present, contamination by microorganisms, especially

pathogen In biology, a pathogen ( el, πάθος, "suffering", "passion" and , "producer of") in the oldest and broadest sense, is any organism or agent that can produce disease. A pathogen may also be referred to as an infectious agent, or simply a germ ...

s, can still cause an object or location to be considered dirty. For example,

computer keyboard A computer keyboard is a peripheral input device modeled after the typewriter keyboard which uses an arrangement of buttons or keys to act as mechanical levers or electronic switches. Replacing early punched cards and paper tape technolog ...

s are especially dirty as they contain on average 70 times more microbes than a lavatory seat. People and animals may eat dirt. This is thought to be caused by

mineral deficiency Mineral deficiency is a lack of the dietary minerals, the micronutrients that are needed for an organism's proper health. The cause may be a poor diet, impaired uptake of the minerals that are consumed, or a dysfunction in the organism's use of the ...

and so the condition is commonly seen in

pregnant women Pregnancy is the time during which one or more offspring develops ( gestates) inside a woman's uterus (womb). A multiple pregnancy involves more than one offspring, such as with twins. Pregnancy usually occurs by sexual intercourse, but ca ...

Neurosis

People may become obsessed by dirt and engage in fantasies and compulsive behaviour about it, such as making and consuming mud pies and pastries. The source of such thinking may be genetic, as the emotion of

disgust Disgust (Middle French: ''desgouster'', from Latin ''gustus'', "taste") is an emotional response of rejection or revulsion to something potentially contagious or something considered offensive, distasteful, or unpleasant. In ''The Expression o ...

is common and the location for this activity in the brain has been proposed.

References

External links

*
Dirt season at the Wellcome Collection
{{Authority control Hygiene Waste