Sink

A sink (also sinker, washbowl, hand basin and wash basin) is a bowl-shaped plumbing fixture used for washing hands, dishwashing, and other purposes. Sinks have taps (faucets) that supply hot and cold water and may include a spray feature to be used for faster rinsing. They also include a drain to remove used water; this drain may itself include a strainer and/or shut-off device and an overflow-prevention device. Sinks may also have an integrated soap dispenser.

When a sink becomes stopped-up or clogged, a person will often resort to use a chemical drain cleaner or a plunger, though most professional plumbers will remove the clog with a drain auger (often called a "plumber's snake").

History

United States

The washstand was a bathroom sink made in the United States in the late 18th century. The washstands were small tables on which were placed a pitcher and a deep bowl, following the English tradition. Sometimes the table had a hole where the large bowl rested, which led to the making of dry sinks. From about 1820 to 1900 the dry sink evolved by the addition of a wooden cabinet with a trough built on the top, lined with zinc or lead. This is where the bowls or buckets for water were kept. Splashboards were sometimes added to the back wall, as well as shelves and drawers, the more elaborate designs usually placed in the kitchen.

Sink (Foetus album)

Sink is a Foetus Inc compilation album that was first released in 1989 on Self Immolation/Some Bizzare. It compiles rare and unreleased songs from various Foetus projects from 1981–1989. Many of the rare tracks on the album have been edited shorter than their original length.

Sink is Foetus' final Some Bizarre record and it saw released in 1995 thanks to Some Bizzare Label Thirsty Ear's effort to reissue the Foetus catalogue. All versions' liner notes contain an up-to-date Foetus discography.

Sink is Self Immolation #WOMB INC 6.

Track listing

All songs by J. G. Thirlwell.

Sink (geography)

Mediterranean Sink during the Messinian Event
Red Sea when blocked by the Perim volcano
Africa: Afar Depression
USA: Carson Sink
USA: Humboldt Sink
USA: Quinn River Sink
USA: Salton Sink

A geographic sink is a depression within an endorheic basin where water collects with no visible outlet. Instead of discharging, the collected water is lost due to evaporation and/or penetration (water sinking underground, e.g., to become groundwater in an aquifer). If the sink has karstic terrain, water will sink at a higher rate than the surface evaporation, and conversely if the lakebed or sink bed has a layer of soil that is largely impervious to water (hardpan), evaporation will predominate. Since dry lakes in sinks with hardpan have little penetration, they require more severe aridity/heat to eliminate collected water at a comparable rate as for a similar sink with appreciable penetration.

Depending on losses, precipitation, and inflow (e.g., a spring, a tributary, or flooding); the temporal result of a lake in a sink may be a persistent lake, an intermittent lake, a playa lake (temporarily covered with water), or an ephemeral lake.

Directed graph

In mathematics, and more specifically in graph theory, a directed graph (or digraph) is a graph, or set of vertices connected by edges, where the edges have a direction associated with them. In formal terms, a directed graph is an ordered pair G = (V, A) (sometimes G = (V, E)) where

It differs from an ordinary or undirected graph, in that the latter is defined in terms of unordered pairs of vertices, which are usually called edges, arcs, or lines.

A directed graph is called a simple digraph if it has no multiple arrows (two or more edges that connect the same two vertices in the same direction) and no loops (edges that connect vertices to themselves). A directed graph is called a directed multigraph or multidigraph if it may have multiple arrows (and sometimes loops). In the latter case the arrow set forms a multiset, rather than a set, of ordered pairs of vertices.

Sink (Floater album)

Sink is an album released by Floater in September 1994. Lyrics of isolation and insanity are set against dark and moody aural landscapes, ambient sampling montages, and savage instrumental punch. Sink received a preliminary Grammy nomination in the category of Best Rock Album. There are four known pressings of the disc art to exist. The first and the rarest pressing shows the sink from the cover of the Sink demo tape. The second pressing shows the blue and white sea swirls with "Floater" and the man on the couch. The third pressing is a solid blue disc that has "Floater" and "Sink" on the top of the disc. The fourth pressing is also a solid blue disc, has "Floater" on the top of the disc and the man on the couch on the bottom. Sink was also released on cassette as well.

Track listing

Sinkhole

A sinkhole, also known as a cenote, sink, sink-hole,shakehole,swallet, swallow hole, or doline (the different terms for sinkholes are often used interchangeably), is a depression or hole in the ground caused by some form of collapse of the surface layer. Some are caused by karst processes—for example, the chemical dissolution of carbonate rocks or suffosion processes. Sinkholes vary in size from 1 to 600 m (3.3 to 2,000 ft) both in diameter and depth, and vary in form from soil-lined bowls to bedrock-edged chasms. Sinkholes may form gradually or suddenly, and are found worldwide. On 2 July 2015, scientists reported that active pits, related to sinkhole collapses and possibly associated with outbursts, were found on the comet 67P/Churyumov-Gerasimenko by the Rosetta space probe.

Formation

Natural processes

Sinkholes may capture surface drainage from running or standing water, but may also form in high and dry places in specific locations.

The formation of sinkholes involves natural processes of erosion or gradual removal of slightly soluble bedrock (such as limestone) by percolating water, the collapse of a cave roof, or a lowering of the water table. Sinkholes often form through the process of suffosion. For example, groundwater may dissolve the carbonate cement holding the sandstone particles together and then carry away the lax particles, gradually forming a void.