thumb|upright|A double oven
thumb|A ceramic oven
An oven is a tool
which is used to expose materials to a hot environment. Ovens contain a hollow chamber and provide a means of heating the chamber in a controlled way. In use since antiquity
, they have been used to accomplish a wide variety of tasks requiring controlled heating. Because they are used for a variety of purposes, there are many different types of ovens
. These types differ depending on their intended purpose and based upon how they generate heat.
Ovens are often used for cooking
, where they can be used to heat food
to a desired temperature
. Ovens are also used in the manufacturing of ceramics
; these ovens are sometimes referred to as kilns
. Metallurgical furnace
s are ovens used in the manufacturing of metals
, while glass furnaces
are ovens used to produce glass
There are many methods by which different types of ovens produce heat. Some ovens heat materials using the combustion
of a fuel
, such as wood
, or natural gas
. Microwave ovens
heat materials by exposing them to microwave radiation
and electric furnaces
heat materials using electricity
. Some ovens use convection
, the movement of gases
inside the heating chamber, to enhance the heating process, or, in some cases, to change the properties of the material being heated, such as in the Bessemer method
The earliest ovens were found in Central Europe
, and date back to 29,000 BC. They were roasting and boiling pits inside yurt
s used to cook mammoth
. In Ukraine
from 20,000 BC they used pits with hot coals covered in ashes. The food was wrapped in leaves and set on top, then covered with earth. In camps found in Mezhirich
, each mammoth bone house had a hearth
used for heating and cooking. Ovens were used by cultures who lived in the Indus Valley
and in pre-dynastic Egypt.
By 3200 BC, each mud-brick house had an oven in settlements across the Indus Valley.
[History Of The Indus Civilization](_blank)
. Historyworld.net. Retrieved on 2011-11-23.
Ovens were used to cook food and to make bricks.
Pre-dynastic civilizations in Egypt used kilns around 5000–4000 BC to make pottery.
Tandır ovens used to bake unleavened flatbread were common in Anatolia during the Seljuk and Ottoman eras, and have been found at archaeological sites distributed across the Middle East. The word tandır comes from the Akkadian tinuru, which becomes tanur in Hebrew and Arabic, and tandır in Turkish. Of the hundreds of bread varieties known from cuneiform sources, unleavened tinuru bread was made by adhering bread to the side walls of a heated cylindrical oven. This type of bread is still central to rural food culture in this part of the world, reflected by the local folklore, where a young man and woman sharing fresh tandır bread is a symbol of young love, however, the culture of traditional bread baking is changing with younger generations, especially with those who reside in towns showing preference for modern conveniences.
During the Middle Ages, instead of earth and ceramic ovens, Europeans used fireplaces in conjunction with large cauldrons. These were similar to the Dutch oven
. Following the Middle-Ages, ovens underwent many changes over time from wood, iron, coal, gas, and even electric. Each design had its own motivation and purpose. The wood-burning stove
s saw improvement through the addition of fire chambers that allowed better containment and release of smoke. Another recognizable oven would be the cast-iron stove. These were first used around the early 1700s when they themselves underwent several variations including the Stewart Oberlin iron stove that was smaller and had its own chimney.
In the early part of the 19th century, the coal oven was developed. It was cylindrical in shape and made of heavy cast iron. The gas oven saw its first use as early as the beginning of the 19th century as well. Gas stove
s became very common household ovens once gas lines were available to most houses and neighborhoods. James Sharp patented one of the first gas stoves in 1826. Other various improvements to the gas stove included the AGA cooker
invented in 1922 by Gustaf Dalén
. The first electric ovens were invented in the very late 19th century, however, like many electrical inventions destined for commercial use, mass ownership of electrical ovens could not be a reality until better and more efficient use of electricity was available.
More recently, ovens have become slightly more high-tech in terms of cooking strategy. The microwave as a cooking tool was discovered by Percy Spencer in 1946, and with the help from engineers, the microwave oven
The microwave oven uses microwave radiation to excite the water molecules in food causing friction, thus producing heat.
[Gallawa, Carlton J]
"How do Microwaves Cook."
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[[file:TW Panasonic NN-S215.jpg">thumb">A [[microwave oven
[[file:Oven.agr.jpg">thumb">Interior of a modern home oven
[[file:Zojirushi toaster oven ET-TB15 2.jpg|thumb|A Japanese toaster oven
[[file:Industrial hearth deck oven and rotary rack oven.JPG|thumb|Industrial "Zanolli" double hearth deck oven (left) and "Sveba-Dahlen" rotary rack oven (right) at the [[Faculty of Food Technology, Latvia University of Life Sciences and Technologies|Faculty of Food Technology]], [[Latvia University of Life Sciences and Technologies]] bakery]]
* ''Double oven'': a built-in oven fixture that has either two ovens,
or one oven and one [[microwave oven]]. It is usually built into the kitchen cabinet.
* ''Earth oven
'': An earth oven is a pit dug into the ground and then heated, usually by rocks or smoldering debris. Historically these have been used by many cultures for cooking. Cooking times are usually long, and the process is usually cooking by slow roasting the food. Earth ovens are among the most common things archaeologists look for at an anthropological dig, as they are one of the key indicators of human civilization and static society.
* ''Ceramic oven
'': The ceramic oven is an oven constructed of clay or any other ceramic material and takes different forms depending on the culture. The Indians refer to it as a tandoor
, and use it for cooking. They can be dated back as far as 3,000 BC, and they have been argued to have their origins in the Indus Valley
Brick ovens are also another ceramic type oven. A culture most notable for the use of brick ovens is Italy and its intimate history with pizza. However, its history also dates further back to Roman times, wherein the brick oven was used not only for commercial use but household use as well.
"The History of Brick Ovens."
* ''Gas oven'': One of the first recorded uses of a gas stove and oven referenced a dinner party in 1802 hosted by Zachaus Winzler, where all the food was prepared either on a gas stove or in its oven compartment. In 1834, British inventor James Sharp began to commercially produce gas ovens after installing one in his own house. In 1851, the Bower's Registered Gas Stove was displayed at the Great Exhibition
. This stove would set the standard and basis for the modern gas oven. Notable improvements to the gas stove since include the addition of the thermostat
which assisted in temperature regulation; also an enamel
coating was added to the production of gas stoves and ovens in order to help with easier cleaning.
* ''Masonry oven
'': Masonry ovens consist of a baking chamber made of fireproof brick
, or clay
. Though traditionally wood-fired
-fired ovens were common in the 19th century. Modern masonry ovens are often fired with natural gas
or even electricity
, and are closely associated with artisanal bread
. In the past, however, they were also used for any cooking task that required baking.
* ''Microwave oven
'': An oven that cooks food using microwave
radiation rather than infrared
radiation (typically a fire source). Conceptualized in 1946, Dr. Percy Spencer
allegedly discovered the heating properties of microwaves while studying the magnetron
. By 1947, the first commercial microwave was in use in Boston, Mass.
“Who Invented Microwaves.”
* ''Toaster oven
'': Toaster ovens are small electric ovens with a front door, wire rack and removable baking pan. To toast bread with a toaster oven, slices of bread are placed horizontally on the rack. When the toast is done, the toaster turns off, but in most cases the door must be opened manually. Most toaster ovens are significantly larger than toasters, but are capable of performing most of the functions of electric ovens, albeit on a much smaller scale.
* ''Wall oven'': Wall ovens make it easier to work with large roasting pans and Dutch ovens. A width is typically 24, 27, or 30 inches. Mounted at waist or eye level, a wall oven eliminates bending. However, it can be nested under a countertop to save space. A separate wall oven is expensive compared with a range.
* ''Steam oven'': An oven that cooks food using steam to provide heat.
Ovens are used as kitchen appliance
s for roasting
and heating. Foods normally cooked in this manner include meat
s and baked goods such as bread
and other dessert
s. In modern times, the oven is used to cook and heat food in many households across the globe.
Modern ovens are typically fueled by either natural gas
, with bottle gas
models available but not common. When an oven is contained in a complete stove, the fuel used for the oven may be the same as or different from the fuel used for the burners on top of the stove.
Ovens usually can use a variety of methods to cook. The most common may be to heat the oven from below. This is commonly used for baking and roasting. The oven may also be able to heat from the top to provide broiling
(US) or grilling
(UK/Commonwealth). A fan-assisted oven that uses a small fan to circulate the air in the cooking chamber, can be used.
[ Ovens Advice Centre Retrieved on 20 July 2013]
Both are also known as convection oven
s. An oven may also provide an integrated rotisserie
Ovens also vary in the way that they are controlled. The simplest ovens (for example, the AGA cooker
) may not have any controls at all; the ovens simply run continuously at various temperatures. More conventional ovens have a simple thermostat
which turns the oven on and off and selects the temperature at which it will operate. Set to the highest setting, this may also enable the broiler element. A timer
may allow the oven to be turned on and off automatically at pre-set times. More sophisticated ovens may have complex, computer
-based controls allowing a wide variety of operating modes and special features including the use of a temperature probe
to automatically shut the oven off when the food is completely cooked to the desired degree.
''Toaster ovens'' are essentially small-scale ovens and can be used to cook foods other than just toasting. A frontal door is opened, horizontally-oriented bread slices (or other food items) are placed on a rack which has heat elements above and below it, and the door is closed. The controls are set and actuated to toast the bread to the desired doneness, whereupon the heat elements are switched off. In most cases the door must be opened manually, though there are also toaster ovens with doors that open automatically. Because the bread is horizontal, a toaster oven can be used to cook toast with toppings, like garlic bread
, melt sandwich
es, or toasted cheese
. Toaster ovens are generally slower to make toast than pop-up toasters, taking 4–6 minutes as compared to 2–3 minutes.
In addition to the automatic-toasting settings, toaster ovens typically have settings and temperature controls to allow use of the appliance as a small oven.
Extra features on toaster ovens can include:
* Heating element control options, such as a "top brown" setting that powers only the upper elements so food can be broiled without heat from below.
* Multiple shelf racks – Having options for positioning the oven shelf gives more control over distance between food and the heating element.
Industrial, scientific, and artisanal
Outside the culinary world, ovens are used for a number of purposes:
* A furnace
can be used either to provide heat to a building or used to melt substances such as glass or metal for further processing. A blast furnace
is a particular type of furnace generally associated with metal smelting
manufacture) using refined coke
or similar hot-burning substance as a fuel, with air pumped in under pressure to increase the temperature of the fire. A blacksmith
uses a temporarily blown furnace, the smith's heart to heat iron to a glowing red to yellow temperature.
* A kiln
is a high-temperature oven used in wood drying
s and cement
manufacturing to convert
mineral feedstock (in the form of clay or calcium or aluminum rocks) into a glassier
, more solid form. In the case of ceramic kilns, a shaped clay object is the final result, while cement kilns produce a substance called clinker
that is crushed to make the final cement product. (Certain types of drying ovens used in food manufacture, especially those used in malting
, are also referred to as kilns.)
* An autoclave
is an oven-like device with features similar to a pressure cooker
that allows the heating of aqueous solutions to higher temperatures than water's boiling point in order to sterilize the contents of the autoclave.
* Industrial oven
s are similar to their culinary equivalents and are used for a number of different applications that do not require the high temperatures of a kiln or furnace.
* Cook stove
* Egyptian egg oven
* Gas Mark
* Kitchen stove
* List of cooking appliances
* Clome oven
* Beehive oven
* Convection microwave
* Trivection oven
* Oven glove
* Reflector oven
* Russian oven
* Solar oven
*Roper, Frances. "Chilean Baking-Oven." Antiquity Publications. Great Britain: 1937. 355–356.
*Sopoliga, Miroslav. "Oven and Hearth in Ukrainian Dwellings of Eastern Slovakia." Acta Ethnografica Academiae Scientiarium Hungaricae. Budapest: 1982. 315–355
*Silltoe, Paul. "The Earth Oven: An Alternative to the Barbecue from the Highlands of Papua New Guinea." The Anthropologists'Cook Book: 1997. 224–231.
* Roger Curtis. "Peruvian or Polynesian: The Stone-Lined Earth Oven of Easter Island." New Zealand Archaeological Association Newsletter. 22, no.3: 1979. 92–96.
*Bauhoff, Gunter. "History of Cast-Iron Oven Plate." Offa Bd. 40: 1983. 191–197.
*Bellis, Mary"History of the Oven from Cast Iron to Electric."
*National Academy of Engineers"Household Appliances-Cooking."
*Gallawa, Carlton J
Article by HowStuffWorks.com