Published by Houghton Mifflin Company. If you are in the market for a new oven and you aren't sure if you should go with a convection oven or a traditional model, consider the pros and cons of buying a convection oven. That convection cycle puts Betelgeuse on a semiregular dimmer switch that fluctuates roughly every 400 days or so. Diffusion of heat takes place in rigid solids, but that is called heat conduct A daily challenge for crossword fanatics. Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012. Convection is either the mass transfer or the heat transfer due to bulk movement. There are four elements essential to convection cooking. A conventional (or traditional) oven cooks food by heating the air inside of it. An oven with a convection setting has a fan and exhaust system that a regular oven does not. These example sentences are selected automatically from various online news sources to reflect current usage of the word 'convection.' Fluid motion caused by an external force such as gravity. convection Convection is a way in which heat travels. Convection is where the hot, less dense part … See the full definition for convection in the English Language Learners Dictionary, Nglish: Translation of convection for Spanish Speakers, Britannica English: Translation of convection for Arabic Speakers, Britannica.com: Encyclopedia article about convection. convection Air heated by a space heater rises, then cools and falls to be heated and rise again. Convection ovens are the smarter and more powerful brothers to conventional ovens. For example, air on a part of the Earth's surface warmed by strong sunlight will be heated by contact with the ground and will expand and flow upward, creating a region of low pressure below it; cooler surrounding air will then flow in to this low pressure region. Whereas gas diffusion involves the statistical motion of atoms and molecules driven by concentration gradients, convection arises from the response to gravitational, centrifugal, electric, and magnetic forces. All rights reserved. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. However, they aren’t as popular as conventional ovens. Is a complex system of ocean currents powered by convection. How does a convection oven work? So air fryers are, in essence, convection ovens. Water vapor and air constantly circulate in turbulent convection currents. Another advantage to convection ovens – the fan and exhaust system reduce the amount of moisture in the oven to help foods crisp and brown on the outside and stay juicy on the inside. Convection is the movement of heat because of the movement of warm matter. Convection heating technology is found in both countertop ovens and spacious built-in ovens. It is the primary form of heat and mass transfer on Earth, and can be found in many systems around the world. The air thus circulates by convection, creating winds. As the air cools, it reaches the dewpoint and all of the moisture in the air condenses– forming clouds. Here, in order to transfer heat, parts of the material itself moves — i.e. The plume of hot air resulting from the convection current is visible. This cycle creates a convection current that circulates hot air throughout a room. In the part BNA, the electricity is carried by a moving conductor; it is said to be displaced by convection. The “convection” in convection ovens refers to heating via air. there is a transfer of mass within the material. The result is hot air being moved throughout the space as it becomes heated. Convection is the process of heat transfer by the bulk movement of molecules within fluids such as gases and liquids. Convection is a bulk gas-flow process that can be distinguished from both diffusion and viscous flow. Convection includes sub-mechanisms of advection, and diffusion. Shrove Tuesday, Mardi Gras, Ash Wednesday, Lent: What Do They All Mean? Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Convection ovens use a fan to circulate the heat. Conventional Ovens Your conventional oven uses a single heating element, usually located on the top or the bottom of the oven. Plus, convection cooking is known for reduced cooking time and improved energy efficiency. If you've ever sat in a hot bath and swirled the water around, the water feels hotter as it flows against your legs. Movement of air by a fan or of water by a pump are examples of forced convection. Convection is the mechanism of heat transfer in materials through a mass flow of the material. mantle convection - The rocky mantle of the Earth moves slowly because of the convection currents that transfer heat from the interior of the Earth up to the surface. What happened? A microwave convection oven is a device that is a combination of a convection oven and a microwave, providing you the features of both, which include cooking, baking, roasting, etc. This is the reason the tectonic plates move gradually around the Earth. Traditional ovens do not have fans and they don't circulate, they just heat up. The force of the air thus transfers more heat to the surface of the food, so that it produces more crispiness than an ordinary oven (but still far less than an actual deep-fryer). These types of convection heaters often have a blower fan that disperses the cold air in the room onto the hot coil. It all boils down to one thing: A convection oven is a traditional oven that is equipped with an additional heating element and a fan, which makes it stand out from the competition when it comes to the way the food is cooked. The star’s temperature hadn’t dropped as much as would be expected if the dimming was from something intrinsic to the star, like its convection cycles, the pair reported in the March 10 Astrophysical Journal Letters. The air inside the oven remains stagnant. The process of heat transfer between a surface and a fluid flowing in contact with it is called convective heat transfer. Convection is the circular motion that happens when warmer air or liquid — which has faster moving molecules, making it less dense — rises, while the cooler air or liquid drops down. The movement of the clouds, the ocean currents and many types of heaters are examples of convection. The bag may be called a "convection shield," slowing convection-cooling due to air currents. Convection definition is - the action or process of conveying. It influences climate all over the planet. The American Heritage® Science Dictionary Heat transfer in a gas or liquid by the circulation of currents from one region to another. Wind, in turn, can enter and cool a room if the window is open. Current in a fluid caused by uneven distribution of heat. circa 1623, in the meaning defined at sense 1, Late Latin convection-, convectio, from Latin convehere to bring together, from com- + vehere to carry — more at way. Air fryers that will revolutionize your kitchen, The Foundations of Science: Science and Hypothesis, The Value of Science, Science and Method. A convection oven works by circulating hot air around the cavity of the oven, helping food to cook faster and more evenly. Convection cannot take place in most solids because neither bulk current flows nor significant diffusion of matter can take place. Delivered to your inbox! Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. What is a Convection Oven? Many ovens have both a convection and a conventional setting, allowing you to choose between the two. The American Heritage® Stedman's Medical Dictionary The rising motion typically cools the air. Convection – When warm, moist air near the surface rises to be above the heavier cool, dry air this is a form of heat transfer or convection. The initial heat transfer between the object and the fluid takes place through conduction, but the bulk heat transfer happens due to the motion of the fluid. Instead of just heating the inside of the food (as regular microwaves do), a convection microwave also browns and cooks the outside of your food. Even with easterly wind shear, Rene is was able to produce vigorous, Preheat a traditional oven to 370 degrees or 350 degrees for, The tubes are cooled using new technology allowing for air, East of Paulette, Tropical Storm Rene has shown some weakening after losing nearly all of its, One idea holds that plates are just a byproduct of burbling, Post the Definition of convection to Facebook, Share the Definition of convection on Twitter. The motion of warm material that rises, cools off, and sinks again, producing a continuous circulation of material and transfer of heat. Published by Houghton Mifflin Harcourt Publishing Company. Accessed 18 Feb. 2021. “Convection.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/convection. © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins The other methods of heat transfer are conduction and radiation. Convection is broadly the movement of any molecules through any fluid state, including liquids and gasses. Convection currents in Earth's mantle move tectonic plates around, causing CONTINENTAL DRIFT. Send us feedback. The New Dictionary of Cultural Literacy, Third Edition A convection oven, meanwhile, has built-in fans that circulate the air during the cooking process. The motion of warm material that rises, cools off, and sinks again, producing a continuous circulation of material and transfer of heat. It also has a heating element with the fan in the back of the oven (this is all technically called true convection). Convection currents transfer heat from one place to another by mass motion of a fluid such as water, air or molten rock. 'Nip it in the butt' or 'Nip it in the bud'. Convection is the transfer of internal energy into or out of an object by the physical movement of a surrounding fluid that transfers the internal energy along with its mass. For example, atmospheric circulation moves warm air to cool places, causing wind. How to use convection in a sentence. Convection ovens can also have a third heating element, called true convection, to help foods cook faster. Do you have the grammar chops to know when to use “have” or “has”? It does this with the help of a fan and exhaust system that blows hot air … Convection is the transfer of heat due to the bulk movement of molecules within fluids, including molten rock. 1. Some examples of processes involving convection are boiling water, in which heat is transferred from the stove to the air; the circulation of the atmosphere of the Earth, transferring heat from the equator to the North Pole and South Pole; and plate tectonics, in which heat is transferred from the interior of the Earth to its surface. What made you want to look up convection? Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021, Collins English Dictionary - Complete & Unabridged 2012 Digital Edition Convection Ovens vs. Published by Houghton Mifflin Harcourt Publishing Company. Copyright © 2011. Although the heat is initially transferred between the object and the fluid by conduction, the bulk transfer of energy comes from the motion of the fluid. Learn a new word every day. All rights reserved. What Is An Em Dash And How Do You Use It? Along with that, you will get features like preheating, reheating, boiling, defrosting, etc. Atmospheric convection currents can be set up by local heating effects such as solar radiation (heating and rising) or contact with cold surface masses (cooling and sinking). Hot material is added at the growing edges of a plate and then it cools. This is illustrated by the seasonal variation in convection. If you’ve ever wondered what exactly is a convection oven and whether or not using the setting makes a difference in your final product, this should help clear things up. Thermal image of a newly lit Ghillie kettle. Convection baking introduces a fan to the interior of an oven, allowing hot air to be blown around and onto the food. Convection heaters that are smaller than normal rely on forced air to help speed up the production of heat instead of traditional convection currents. So Convection is the force behind earthquakes and volcanoes. My grandmother ________ a wall full of antique cuckoo clocks. Understandably so: convection cooking is rarely mentioned in recipes or cookbooks. The Most Surprisingly Serendipitous Words Of The Day, “Definitely” vs. “Definitively”: Be Certain You Know The Difference, The Dictionary.com Word Of The Year For 2020 Is …, “Affect” vs. “Effect”: Use The Correct Word Every Time. Please tell us where you read or heard it (including the quote, if possible). A Physics revision video explaining the process of heat transfer by Convection. Convection is a major factor in weather. Betelgeuse went dark, but didn’t go supernova. Now, in a convection oven, the fan produces extra energy. Let’s find out with this quiz! Convection happens when there is a difference in temperature between two parts of a liquid or gas. In summer, when the gradient is steepest, convection reaches its maximum. A convection oven is an oven that heats food using the circulation of hot air. The Great Conveyor Belt. It occurs when heat is transferred by the movement of liquids or gases. The convection technology in air fryers allows you to roast, bake, and even dehydrate your favorite foods. The heat transfer function of convection currents drives the earth’s ocean currents, atmospheric weather and geology. Test your knowledge - and maybe learn something along the way. Explainer: Our atmosphere — layer by layer. Why Do “Left” And “Right” Mean Liberal And Conservative? They get things done faster, more efficiently, evenly, and way better.. the vertical transport of atmospheric properties, especially upward (distinguished from, a process of heat transfer through a gas or liquid by bulk motion of hotter material into a cooler region, the process by which masses of relatively warm air are raised into the atmosphere, often cooling and forming clouds, with compensatory downward movements of cooler air, the slow circulation of subcrustal material, thought to be the mechanism by which tectonic plates are moved. It takes the hot air and blows it around, literally increasing the force with which the hot air meets the surface of the roast. The physics of the design itself has been around for much longer than that—they’re essentially a refined design of the traditional convection oven. Dictionary.com Unabridged There are three heating elements covering the top, bottom, and rear of the oven, and the fourth element is the fan. What is Convection. The short and sweet answer is that convection microwaves offer the quick-cooking features of a microwave, with the browning, crisping, and full “cook-through” of a traditional oven. the transfer of heat by the circulation or movement of the heated parts of a liquid or gas. 'All Intensive Purposes' or 'All Intents and Purposes'? This mode of propagation may better be described as a convection of excitation. Convection occurs when particles with a lot of heat energy in a liquid or gas move and take the place of particles with less heat energy. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!
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