Fuel oil or heavy oil is a fraction obtained from petroleum distillation, either as a distillate or a residue. Broadly speaking, fuel oil is any liquid fuel that is burned in a furnace or boiler for the generation of heat or used in an engine for the generation of power, except oils having a flash point of approximately 40 °C (104 °F) and oils burned in cotton or wool-wick burners. In this sense, diesel is a type of fuel oil. Fuel oil is made of long hydrocarbon chains, particularly alkanes, cycloalkanes and aromatics. The term fuel oil is also used in a stricter sense to refer only to the heaviest commercial fuel that can be obtained from crude oil, i.e., heavier than gasoline and naphtha.
In Australia the term "distillate" refers specifically to diesel fuel.
Although the following trends generally hold true, different organizations may have different numerical specifications for the six fuel grades. The boiling point and carbon chain length of the fuel increases with fuel oil number. Viscosity also increases with number, and the heaviest oil has to be heated to get it to flow. Price usually decreases as the fuel number increases.
A bunker is a defensive military fortification designed to protect people or valued materials from falling bombs or other attacks. Bunkers are mostly underground, compared to blockhouses which are mostly above ground. They were used extensively in World War I, World War II, and the Cold War for weapons facilities, command and control centers, and storage facilities (for example, in the event of nuclear war). Bunkers can also be used as protection from tornadoes.
Trench bunkers are small concrete structures, partly dug into the ground. Many artillery installations, especially for coastal artillery, have historically been protected by extensive bunker systems. Typical industrial bunkers include mining sites, food storage areas, dumps for materials, data storage, and sometimes living quarters. When a house is purpose-built with a bunker, the normal location is a reinforced below-ground bathroom with fibre-reinforced plastic shells. Bunkers deflect the blast wave from nearby explosions to prevent ear and internal injuries to people sheltering in the bunker. Nuclear bunkers must also cope with the underpressure that lasts for several seconds after the shock wave passes, and block radiation.
A hazard is an area of a golf course in the sport of golf which provides a difficult obstacle, which may be of two types: (1) water hazards such as lakes and rivers; and (2) man-made hazards such as bunkers. Special rules apply to playing balls that fall in a hazard. For example, a player may not touch the ground with his club before playing a ball, not even for a practice swing. A ball in any hazard may be played as it lies without penalty. If it cannot be played from the hazard, the ball may be hit from another location, generally with a penalty of one stroke. The Rules of Golf govern exactly from where the ball may be played outside a hazard. Bunkers (or sand traps) are shallow pits filled with sand and generally incorporating a raised lip or barrier, from which the ball is more difficult to play than from grass.
A bunker is a depression near the green or fairway that is usually filled with sand. It is difficult to hit the ball out of the bunker and entering it is therefore considered punitive to a golfer who misses the target with the previous shot. A club called a "sand wedge" is designed for extracting the ball from a bunker, a process requiring well-developed skill. After a player is done using the bunker, it is the job of either the player or that player's caddy to rake the area of the sand disturbed during play. Specific rules of golf govern play from a bunker. For example, a player may not ground one's club in a bunker; that is, the club cannot touch the ground prior to the swing.
The Bunker (also Reichsbahnbunker) in Berlin-Mitte is a listed air-raid shelter. Originally based on plans of the architect Karl Bonatz, it was constructed in 1943 by Nazi Germany to shelter up to 3,000 Reichsbahn train passengers. The square building has an area of 1000 m² and is 18 metres high; its walls are up to two metres thick. There are 120 rooms on five floors. In May 1945, the Red Army took the building and turned it into a prisoner-of-war camp. From 1949, it was used to store textiles and from 1957, as storage for dry and tropical fruit.
In the summer of 1992, it was turned into a hardcore techno club.Gabba, hard trance, house and breakbeat parties were held on four floors. However, after a raid in 1995 the events became more irregular. A further raid in 1996 placed severe building restrictions on the tenants, causing the club to close.
In 2001, real estate investor Nippon Development Corporation GmbH bought the building from the government. In 2002, it was the venue of the Berlin art festival "Insideout".