Barrel in the context of "Cylindrical"

A gun barrel is a crucial part of gun-type weapons such as small firearms, artillery pieces, and air guns. It is the straight shooting tube, usually made of rigid high-strength metal, through which a contained rapid expansion of high-pressure gas(es) is used to propel a projectile out of the front end (muzzle) at a high velocity. The hollow interior of the barrel is called the bore, and the diameter of the bore is called its calibre, usually measured in inches or millimetres.

The first firearms were made at a time when metallurgy was not advanced enough to cast tubes capable of withstanding the explosive forces of early cannons, so the pipe (often built from staves of metal) needed to be braced periodically along its length for structural reinforcement, producing an appearance somewhat reminiscent of storage barrels being stacked together, hence the English name.

Liquor (/ˈlɪkər/ LIK-ər, sometimes hard liquor), spirits, distilled spirits, or spiritous liquor are alcoholic drinks produced by the distillation of grains, fruits, vegetables, or sugar that have already gone through alcoholic fermentation. While the word liquor ordinarily refers to distilled alcoholic spirits rather than drinks produced by fermentation alone, it can sometimes be used more broadly to refer to any alcoholic beverage (or even non-alcoholic ones produced by distillation or some other practices, such as the brewed liquor of a tea).

The distillation process concentrates the alcohol, so the resulting condensate has an increased alcohol by volume. As liquors contain significantly more alcohol (ethanol) than other alcoholic drinks, they are considered "harder". In North America, the term hard liquor is sometimes used to distinguish distilled alcoholic drinks from non-distilled ones, whereas the term spirits is more commonly used in the United Kingdom. Some examples of liquors include vodka, rum, gin and tequila. Liquors are often aged in barrels, such as for the production of brandy and whiskey, or are infused with flavorings to form flavored liquors, such as absinthe.

Contentment is a state of being or emotion in which one is satisfied with their current life situation, and the state of affairs in one's life as they presently are. If one is content, they are at inner peace with their situation and how the elements in one's life are situated. Contrary to popular belief, it is possible to be content with one's life regardless of the circumstance, regardless of whether things are going as one expected or not.

The root of the word contentment comes from the Latin contentus, which means "held together" or "intact, whole." Originally, contentus was used to describe containers, literally things like cups, buckets, and barrels. Later, the word evolved into something that could reflect onto a person, which describes one who feels complete, with no desires beyond themselves.

A raft is any flat structure for support or transportation over water. It is usually of basic design, characterized by the absence of a hull. Rafts are usually kept afloat by using any combination of buoyant materials such as wood, sealed barrels, or inflated air chambers (such as pontoons), and are typically not propelled by an engine. Rafts are an ancient mode of transport; naturally occurring rafts such as entwined vegetation and pieces of wood have been used to traverse water since the dawn of humanity.

A cooper is a craftsman who produces wooden casks, barrels, vats, buckets, tubs, troughs, and other similar containers from timber staves that were usually heated or steamed to make them pliable.

Journeymen coopers also traditionally made wooden implements, such as rakes and wooden-bladed shovels. In addition to wood, other materials, such as iron, were used in the manufacturing process. The trade is the origin of the surname Cooper.

Escapology is the practice of escaping from restraints or other traps. Escapologists (also called escape artists) escape from handcuffs, straitjackets, cages, coffins, steel boxes, barrels, bags, burning buildings, fish-tanks, and other perils, often in combination.

The conga, also known as tumbadora, is a tall, narrow, single-headed drum from the Congo. Congas are staved like barrels and classified into three types: quinto (lead drum, highest), tres dos or tres golpes (middle), and tumba or salidor (lowest). Congas were originally used in Afro-Cuban music genres such as conga (hence their name) and rumba, in which each drummer would play a single drum. Following numerous innovations in conga drumming and construction during the mid-20th century, as well as its internationalization, it became increasingly common for drummers to play two or three drums. Congas have become a popular instrument in many forms of Latin music such as son (when played by conjuntos), descarga, Afro-Cuban jazz, salsa, songo, merengue and Latin rock.

The origins of the conga drum can be traced back to West and Central Africa, especially regions now known as Congo, Nigeria, and Angola. The modern version of the conga was developed by Cuban people of African descent during the late 19th century or early 20th century. Its direct ancestors are thought to be the yuka and makuta (of Bantu origin) and the bembé drums (of Yoruba origin). In Cuba and Latin America, congas are primarily played as hand drums. In Trinidadian calypso and soca, congas are sometimes struck with mallets, while in the Congos, they are often struck with one hand and one mallet.