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A pocketknife is a knife with one or more blades that fold into the handle. They are also known as jackknives (jack-knife), folding knives, EDC knife, or may be referred to as a penknife, though a penknife may also be a specific kind of pocketknife. [ 1][ 2] A typical blade length is 5 to 15 centimetres (2 to 6 in).
A variety of blade materials can be used to make the blade of a knife or other simple edged hand tool or weapon, such as a sickle, hatchet, or sword. The most common blade materials are carbon steel, stainless steel, tool steel, and alloy steel. Less common materials in blades include cobalt and titanium alloys, ceramic, obsidian, and plastic .
In engineering, the unit is usually Stoke or centiStoke, with 1 Stoke = 0.0001 m^2/s, and 1 centiStoke = 0.01 Stoke. For liquid, the dynamic viscosity is usually in the range of 0.001 to 1 Pascal-second, or 1 to 1000 centiPoise. The density is usually on the order of 1000 kg/m^3, i.e. that of water. Consequently, if a liquid has dynamic ...
Rockwell scale. The Rockwell scale is a hardness scale based on indentation hardness of a material. The Rockwell test measures the depth of penetration of an indenter under a large load (major load) compared to the penetration made by a preload (minor load). [1] There are different scales, denoted by a single letter, that use different loads or ...
Knife collecting. A collection of pocket knives. Knife collecting is a hobby which includes seeking, locating, acquiring, organizing, cataloging, displaying, storing, and maintaining knives. Some collectors are generalists, accumulating an assortment of different knives. [1] Others focus on a specialized area of interest, perhaps bayonets ...
Mad Dog Knives. Marble Arms. Masahiro Katana. Medford Knife and Tool. Microtech Knives. Morseth. Muela (knife manufacturer) Murphy Knives. Museum Replicas Ltd.
2008–2022. The Gerber Mark II is a fighting knife manufactured by Gerber Legendary Blades from 1966 to 2000, with an additional limited run of 1500 in 2002, [1] and full production resuming as of July 2008. [2] It was designed by retired United States Army Captain, Clarence A. “Bud” Holzmann, who based the pattern on a Roman Mainz Gladius.
t. e. The viscosity of a fluid is a measure of its resistance to deformation at a given rate. [1] For liquids, it corresponds to the informal concept of "thickness": for example, syrup has a higher viscosity than water. [2] Viscosity is defined scientifically as a force multiplied by a time divided by an area.