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Fill Power
Fill power is a measure of the loft or "fluffiness" of a down product that is loosely related to the insulating value of the down. The higher the fill power, the more air a certain weight of the down can trap, and thus the more insulating ability the down will have. Fill power is commonly given as a specific volume (the inverse of density), expressed in cubic inches per ounce. Common fill power values range from about for feathers to around for the highest quality goose down. The rare and relatively expensive down of certain wild waterfowl species such as the Muscovy duck or Common eider can have higher fill powers than goose down. Higher fill powers are associated with a larger percentage of down clusters and a larger average down cluster size. Measurement Fill power is the most frequently used measure of down quality. It involves measurements taken of a 30g sample of down in a plexiglas cylinder with a weighted piston compressing the down. The test requires controlled temperat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Down Feather
The down of birds is a layer of fine feathers found under the tougher exterior feathers. Very young birds are clad only in down. Powder down is a specialized type of down found only in a few groups of birds. Down is a fine thermal insulator and padding, used in goods such as Down jacket, jackets, bedding (duvets and featherbeds), pillows and sleeping bags. The discovery of feathers trapped in ancient amber suggests that some species of non-avian dinosaur likely possessed down-like feathers. Description and etymology The word ''down'' comes from the Old Norse word ''dúnn'', which had the same meaning as its modern equivalent. The down feather is considered to be the most "straightforward" of all feather types. It has a short or vestigial rachis (shaft), few barb (feather), barbs, and barbules that lack hooks. There are three types of down: natal down, body down and powder down. Natal down is the layer of down feathers that cover most birds at some point in their early developmen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Specific Volume
In thermodynamics, the specific volume of a substance (symbol: , nu) is the quotient of the substance's volume () to its mass (): :\nu = \frac It is a mass-specific intrinsic property of the substance. It is the reciprocal of density (rho) and it is also related to the molar volume and molar mass: :\nu = \rho^ = \frac The standard unit of specific volume is cubic meters per kilogram (m3/kg), but other units include ft3/lb, ft3/slug, or mL/g. Specific volume for an ideal gas is related to the molar gas constant () and the gas's temperature (), pressure (), and molar mass (): : \nu = \frac It's based on the ideal gas law, PV = , and the amount of substance In chemistry, the amount of substance (symbol ) in a given sample of matter is defined as a ratio () between the particle number, number of elementary entities () and the Avogadro constant (). The unit of amount of substance in the International ..., n = m/M Applications Specific volume is commonly applied to: * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Density
Density (volumetric mass density or specific mass) is the ratio of a substance's mass to its volume. The symbol most often used for density is ''ρ'' (the lower case Greek letter rho), although the Latin letter ''D'' (or ''d'') can also be used: \rho = \frac, where ''ρ'' is the density, ''m'' is the mass, and ''V'' is the volume. In some cases (for instance, in the United States oil and gas industry), density is loosely defined as its weight per unit volume, although this is scientifically inaccurate this quantity is more specifically called specific weight. For a pure substance, the density is equal to its mass concentration. Different materials usually have different densities, and density may be relevant to buoyancy, purity and packaging. Osmium is the densest known element at standard conditions for temperature and pressure. To simplify comparisons of density across different systems of units, it is sometimes replaced by the dimensionless quantity "relative den ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Muscovy Duck
The Muscovy duck (''Cairina moschata'') is a duck native to the Americas, from the Lower Rio Grande Valley of Texas and Mexico south to Argentina and Uruguay. The species has been Domestic Muscovy duck, domesticated, and feral Muscovy ducks can be found locally in New Zealand, Australia, the United States, and in Central and Eastern Europe. Description It is a large duck, with the males significantly larger than the females. The males are long and weigh up to ; females are long and weight, roughly half the weight of the males. The wingspan is from . The plumage is predominantly black, with large white patches on the wing; the back and wing feathers being iridescent and glossy in males, while the females are more drab. Muscovy ducks have long claws on their feet and a wide, flat tail. On the head, the male has a short crest on the nape. The bill is black with a speckling of pale pink. A blackish or dark red knob can be seen at the bill base, which is similar in colour to the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Common Eider
The common eider (pronounced ) (''Somateria mollissima''), also called St. Cuthbert's duck or Cuddy's duck, is a large ( in body length) sea-duck that is distributed over the northern coasts of Europe, North America and eastern Siberia. It breeds in Arctic and some northern temperate regions, but winters somewhat farther south in temperate zones, when it can form large flocks on coastal waters. It can fly at speeds up to . The eider's nest is built close to the sea and is lined with eiderdown, plucked from the female's breast. This soft and warm lining has long been harvested for filling pillows and quilts, but in more recent years has been largely replaced by down from domestic farm-geese and synthetic alternatives. Although eiderdown pillows or quilts are now a rarity—typically being marketed as luxury goods—eiderdown harvesting continues and is sustainable, as it can be done after the ducklings leave the nest with no harm to the birds. Taxonomy The common eider was for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Goose
A goose (: geese) is a bird of any of several waterfowl species in the family Anatidae. This group comprises the genera '' Anser'' (grey geese and white geese) and '' Branta'' (black geese). Some members of the Tadorninae subfamily (e.g., Egyptian goose, Orinoco goose) are commonly called geese, but are not considered "true geese" taxonomically. More distantly related members of the family Anatidae are swans, most of which are larger than true geese, and ducks, which are smaller. The term "goose" may refer to such bird of either sex, but when paired with "gander", "goose" refers specifically to a female one ("gander" referring to a male). Young birds before fledging are called goslings. The collective noun for a group of geese on the ground is a gaggle; when in flight, they are called a skein, a team, or a wedge; when flying close together, they are called a plump. Etymology The word "goose" is a direct descendant of Proto-Indo-European ''*ǵʰh₂éns''. In Germanic lang ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sleeping Bag
A sleeping bag is an insulated covering for a person, essentially a lightweight quilt that can be closed with a zipper or similar means to form a tube, which functions as lightweight, portable bedding in situations where a person is sleeping outdoors (e.g. when camping, hiking, hill walking or climbing). It is also commonly used indoors for people who do not have beds or at sleepovers. Its primary purpose is to provide warmth and thermal insulation through its synthetic or down insulation. It also typically has a water-resistant or water-repellent cover that protects, to some extent, against wind chill and light precipitation, but a tent is usually used in addition to a sleeping bag, as it performs those functions better. The bottom surface also provides some cushioning, but a sleeping pad or camp cot is usually used in addition to that purpose. The bottom surface of a sleeping bag may be moderately water repellent, but a plastic Tarpaulin, tarp or groundsheet is often used to p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
EN 13537
EN 13537 (or EN13537) is a European standard designed to standardize the temperature ratings on sleeping bags manufactured and/or sold in Europe. As of 1 January 2005 a CEN criterion came into effect covering the testing and publication of temperature ratings for sleeping bags. The new criterion differs from the standards that existed formerly. In 2016 this standard was superseded by ISO EN 23537:2016, and then ISO 23537-1:2022. Sleeping bag labeling A European criterion for sleeping bags came into effect on 1 January 2005. This criterion has significant legal connotations for brands, distributors and retailers selling sleeping bags in Europe. There is a key change to the way sleeping bags are labeled. A European criterion means that all sleeping bags adhering to the criterion will have the temperature ratings set by a standard laboratory test. This means that sleeping bags from different manufacturers will all have comparable temperatures. There is no legal obligation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Down Jacket
The down jacket, known more commonly in the fashion industry as a puffer jacket or simply puffer, is a quilted winter jacket which is insulated with either duck or goose feathers. Air pockets created by the bulk of the feathers allow for the retention of warm air. Properties Down is favored among hikers and backpackers because it can easily compress into a small size to fit in a backpack, and it has the highest warmth to weight ratio. The down's loft in the jacket is measured with the term "fill power" which represents the number of cubic inches one ounce fills. For example, one ounce of 700 fill-power down will fill 700 cubic inches. A jacket with larger fill power will compress better and have a lighter weight relative to the jacket's volume and warmth. Usually goose down is loftier than duck down. "Box construction" baffles are warmer than "sewn through" baffles. In contrast, if water absorbs into the jacket's down material, the down looses its puffy loft, and loses its w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Duvet
A duvet ( , ; ), usually called a comforter or (''down-filled'') quilt in American English, and a doona in Australian English, is a type of bedding consisting of a soft flat bag filled with down feather, down, feathers, wool, cotton, silk, or a synthetic alternative, and is typically protected with a removable duvet cover, cover, similar to a pillow and pillow case. The term ''duvet'' is mainly British, especially in reference to the bedding; rarely used in US English, it often refers to the cover. Sleepers often use a duvet without a top bed sheet, as the duvet cover can readily be removed and laundered as often as the bottom sheet. Duvets (known there as eiderdowns, in translation) originated in rural Europe and were filled with the down feathers of ducks or geese. The best quality feathers are taken from the Eider, eider duck, which is known for its effectiveness as a Thermal insulation, thermal insulator. Prior to the uptake of the duvet as a popular bedding option in Bri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Insulators
Insulator may refer to: * Insulator (electricity), a substance that resists electricity ** Pin insulator, a device that isolates a wire from a physical support such as a pin on a utility pole ** Strain insulator, a device that is designed to work in mechanical tension to withstand the pull of a suspended electrical wire or cable ** Mott insulator, a type of electrical insulator ** Topological insulator, a material that behaves as an insulator in its interior while permitting the movement of charges on its boundary * Insulator (genetics), an element in the genetic code * Thermal insulation, a material used to resist the flow of heat * Building insulation Building insulation is material used in a building (specifically the building envelope) to reduce the flow of thermal energy. While the majority of insulation in buildings is for thermal insulation, thermal purposes, the term also applies to ..., the material used in building construction to prevent heat loss See also * ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
