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How is a Microwave Built Microwave ovens have brought household convenience to a whole new level They are designed to fit into wall cabinets or on top of kitchen islands They are constructed from a variety materials builtin microwaves emitting microwaves was first invented in 1940 at Birmingham University in England Percy Spencer realized that this device could heat food when he watched eggs pop and corn cook Raw Materials Microwave MW heating is gaining a lot of attention in material processing due to its inherent advantages such as quicker heating uniform heating noncontact nature and low energy consumption Heating with MW can be applied on a wide range of engineering materials including metals ceramics and polymers Recently it was also used for bulk metal joins the cladding of metallic powders that are not similar to each other onto metallic substrates and casting The main raw material for microwave ovens is iron that is extracted from earth by mining and extraction processes that consume huge quantities of energy and generate greenhouse gases The other key material is plastic which is derived from natural organic substances like cellulose and crude oil Plastic production generates indirect greenhouse gases due to the use fossil fuels for heat and electricity and direct emissions from chemical processes like the production of Bisphenol A and phthalates When the raw materials have been procured they go through an extensive process of manufacturing and quality control to ensure they are in compliance with federal regulations During the manufacturing process different emissions and wastes like solvents dust and oils are produced The finished product will be delivered to retailers and finally to the consumer The majority of microwaves are shipped by truck which consumes significant amounts of energy and also produces greenhouse gasses After the microwave is purchased it is typically used for a few years before becoming obsolete and being removed Microwaves last a limited time therefore recycling and disposal at the end of their life options are vital to reduce the amount of waste and emissions Design Microwave ovens cook food by emitting electromagnetic radiation in the microwave range 300 MHz to 300 GHz The radiation travels through the microwave oven and cooks food The microwave ovens are designed to shield against harmful effects of the radiation including arcing that could damage the oven as well as the food it contains There are different types of microwave ovens available on the market each having its own advantages and disadvantages Consider the size of your kitchen the size of it and your cooking needs when choosing the right microwave For instance if you have a limited counter space you might want to consider an integrated model that folds the appliance away The design process for microwaves begins with acquisition of raw materials which are then processed to make the various components of the oven These include the oven cavity and frame turntable glass tray magnetron tube with transformer and capacitor diode waveguide and electromechanical components motors relays switches motors The casing is typically made of metals such as galvanized or aluminum steel or brass After being assembled after which the microwave is tested and packaged for delivery Packaging is usually made from recycled materials such as paper and cardboard or recyclable plastics like polyethylene terephthalate and polyvinylchloride The new microwaves are transferred to transport tools such as ships planes or even cars These devices convert chemical energy to mechanical energy using fossil fuels The energy is then used to transport microwaves to their users Once the microwaves are delivered they are plugged into the system and consumed by users builtin microwave is the stage of the life cycle that consumes the most energy and produces the most emissions such as carbon dioxide Manufacture Microwave ovens are among the most popular appliances in modern kitchens What exactly makes a microwavable work To learn more lets take a a look at the process of making this staple of the home Metals plastic parts and other electrical parts are the primary materials needed to manufacture a microwave Certain of these components are found in the earth but others require processing The manufacturing process is also energyintensive which results in greenhouse gas emissions This phase of production is the primary cause of the environmental impact of microwaves In the manufacturing process most of the material is assembled using automated machines A large part of the assembly is carried out in a factory which is where workers are working on conveyor belts Workers use a machine create the door and case After the frame has been made its rinsed in an alkaline cleanser to get rid of dirt and oil It is then put together using bolts and screws to make a secure frame for the cavity inside After the chassis is constructed after which the magnetron and other components are put in The magnetron emits radio waves that cause water molecules to warm up In this phase there are safety hazards like the possibility that plasticizers will get into the food or the oven may explode if its empty When the microwave is constructed it goes through rigorous testing and inspection to make sure that it meets federal standards The product is then packaged and distributed to consumers The transport of microwaves between factories and retailers can result in an environmental burden The equipment used to transmit microwaves are powered by fossil fuels which release carbon dioxide and greenhouse gases into the air Testing Microwaves are electromagnetic waves that are part of the electromagnetic spectrum This spectrum is made up of different types of energy that travel through space including visible light radio waves and infrared energy as well as ultraviolet radiation Microwaves heat food by using the process of microwave heating This uses electromagnetic radiation to cause the water molecules to vibrate and spin This allows the food to be heated without heating the air around it or changing its physical structure Microwaving is a safe method of heating food because the microwave radiation doesnt harm cells of the food or cause them to become radioactive However those who have pacemakers should stay away from microwaves since the radiation can interfere with the electrical signals of certain electronic cardiac devices This issue has been resolved by using a special shielding Certain chemicals used in microwave ovens can be harmful to your health including bisphenol A BPA and phthalates Numerous studies have demonstrated that BPA can be released from plastic containers into food and phthalates are believed to be linked to an increased risk of developing reproductive problems Microwave radiation can also damage the eyes tissues and cause cataracts In todays NOPR test procedures todays NOPR require that microwaves be tested in their microwave only cooking mode as well as convection microwave cooking modes in order to measure energy consumption of appliances under realistic usage conditions The test method uses water and the basic ingredients to mimic food items that could be reheated using the microwave The mixtures are then poured into a glass borosilicate container heated in the microwave and measured for thermal efficiency Packaging Many microwaveready dishes employ an exclusive method of packaging referred to as modified atmospheric packaging MAP This packaging method uses oxygeneliminating gas to extend the shelflife of food that is precooked These gases are usually made from carbon dioxide or pure nitrogen and oxygen They function by removing air from the foods environment This helps prevent spoilage and increases the time of the meal for the consumer The MAP method can also be used to package meat products such as frozen steaks or patties of beef These packagings contain nonwoven films that absorb moisture and help to keep food moist and fresher for longer This kind of packaging also reduces waste by reducing the amount of water and air that is lost during the heating process When choosing a microwave consumers should consider its size and power level as well as other features such as sensors for cooking or defrost settings These features can help make cooking more efficient but its essential to consider how often these functions are used in order to avoid spending money on an appliance with additional functions that will be inactive most of the time The design of the microwave is another consideration as some models have a flushbuiltin design that fits seamlessly into the cabinetry of the present