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How is a Microwave Built? Microwaves have taken household convenience to a whole new level. They are designed to fit into cabinets on the walls or over kitchen islands. They are also manufactured with a variety of materials. In 1940 the cavity magnetron tube emitting microwaves was developed at Birmingham University in England. Percy Spencer discovered that this device could cook food after watching the corn pop and eggs cook. Raw Materials Microwave (MW) heating is growing in popularity in the field of material processing due to its inherent benefits such as faster heating and uniform heating. Its non-contact nature and low energy consumption and faster heating are also advantages. Heating with MW is used in various engineering materials such as ceramics, metals and composites. Recently, it has also been modified for bulk metal joining, cladding of metallic powders with different properties on metallic substrates, and casting. Metal is the primary raw material used in microwave ovens. It is mined from the earth by means of processes that consume lots of energy and produce greenhouse gases. The other major component is plastic, which originates from organic compounds like cellulose and crude oil. Plastic production generates indirect greenhouse gases through the use of fossil fuels for electricity and heat, and direct emissions from chemical processing like the production of phthalates and Bisphenol A. Once the raw materials are acquired, they are subjected to rigorous manufacturing and quality controls to meet strict federal standards. In the process of manufacturing, various wastes and emissions such as solvents oils and dust, are produced. The final product will then be shipped to retailers, and then to the consumer. The majority of microwaves are shipped via truck. This also uses a lot of energy, and creates greenhouse emissions. When you purchase a microwave, it is typically used for a few years before it becomes obsolete and is discarded. Because the lifespan of microwaves is short recycling and disposal options are essential to reducing waste and emissions. Design Microwave ovens cook food by emitting electromagnetic waves in the microwave region (300 MHz – 300 GHz). The radiation travels through the microwave oven and cooks the food. The microwave ovens are designed to shield the user from harmful effects of the radiation. This includes arcing, which could harm the oven as well as the food inside. There are a variety of microwavable ovens on the market. Each has its own pros and cons. When choosing a microwave oven take into consideration the size of your kitchen and also your cooking requirements. For instance, if you have limited counter space, think about an integrated model that folds the appliance away. The design of a microwave oven starts with the purchase of raw materials. They are then transformed into the various parts. The oven's cavity and frame are two of them, as well as the turntable, glass tray and magnetron tube that includes capacitor and transformer. The casing is usually comprised of metals, such as aluminum steel or galvanized steel, or brass. The microwave is packaged and tested after assembly. The packaging is typically made of recycled materials like paper and cardboard or recyclable plastics such as polyethylene terephthalate and polyvinylchloride. The new microwaves are then transferred to transport tools such as planes, ships, or cars. These tools use fossil fuels to convert chemical energy into mechanical energy which is used to move the microwaves on their way to the customers. After the microwaves are delivered, they are plugged into the system and consumed by customers. This is the most energy-intensive phase in the lifecycle, and produces emissions like carbon dioxide. Manufacture Microwaves are an essential appliance in modern kitchens. What is it that makes a microwave work? Let's take a look at how to build this staple of the home. Metals, plastic components and other electrical components are the primary materials needed for the production of a microwave. These can be obtained from the earth, but some require processing to produce them. The manufacturing process also requires the use of energy, which results in the emission of greenhouse gases. This manufacturing stage is the main cause of a microwave's environmental impact. During the manufacturing phase most of the product is assembled by automated machines. The assembly process is carried out in a factory where workers are on a conveyor. Workers use a machine shape sheet metal into the door and outer case. After the frame is constructed it is washed with an alkaline cleaner in order to remove dirt and oil. The frame is then put together with screws and bolts in order to create an extremely secure chassis. After the chassis is constructed the magnetron and the other components are put in. The magnetron emits electromagnetic radiation, which cause water molecules to heat up. During this phase there are risks to safety like the possibility that plasticizers will leach into the food or the oven could explode when it's empty. The microwave will be thoroughly tested and inspected once it is assembled to ensure that it is in compliance with the standards of the federal government. The product is then packaged and distributed to customers. Transporting microwaves from the factory to retailers is an environmental burden. The equipment used to transport and deliver the microwaves use fossil fuels that release carbon dioxide and other greenhouse gases into the air. Testing Microwaves are electromagnetic waves that form part of the electromagnetic spectrum. This spectrum is made up of a variety of forms of energy that move through space, such as radio waves, visible light and infrared energy as well as ultraviolet radiation. Microwaves heat food by using the process of microwave heating. This makes use of electromagnetic radiation to cause water molecules to vibrate and spin. This causes food to be heated, without heating the air around it or altering the physical structure of the food. Microwaving is a safe method to cook food because microwave radiation doesn't harm cells in the food or make them radioactive. However, those with pacemakers should stay away from microwaves since the radiation can interfere with the electrical signals of some electronic cardiac devices. This issue has been resolved by using a special shielding. Bisphenol A (BPA) along with phthalates and other chemicals present in microwave ovens may be harmful to your health. Numerous studies have proven that BPA can leach from plastic containers into food, and phthalates are believed to be linked to an increase in the risk of reproductive problems. Microwave radiation may also harm the eye's tissues and cause cataracts. The test procedures in the current NOPR stipulate that microwave ovens are tested in their microwave-only cooking mode as well as convection-microwave cooking modes in order to determine the appliances' energy consumption during representative usage conditions. The test method uses a mixture of water and the basic ingredients to simulate food that can be heated in the microwave. The mixtures are then poured into a glass borosilicate container, heated in the microwave, then tested for thermal efficiency. Packaging Many microwave-ready dishes employ a specific method of packaging referred to as modified atmospheric packaging (MAP). microwave and oven built in combo of packaging utilizes oxygen-eliminating gases to prolong the shelf-life of pre-cooked foods. These gases are often made from carbon dioxide, pure oxygen as well as nitrogen. They operate by removing oxygen from the food's surroundings. This helps prevent spoilage and increases the shelf life of the meal for the consumer. The MAP process can also be used for meat products, like frozen steaks, chicken wings, or beef patties. These packages contain a nonwoven film, which absorbs moisture and helps keep the food fresh and moist for a longer period of time. This type of packaging reduces consumption since it reduces amount of air and water that are lost in the heating process. When deciding on a microwave, consumers must take into consideration the size and power level, as in addition to other features, such as defrost settings or sensor cooking. These features can help make cooking more convenient, but it's important to consider the frequency at which these features will be used to avoid paying for a microwave that has additional features that will sit dormant most of the time. The design of the microwave is a further aspect to consider, since some models feature a flush built-in design that seamlessly integrates into cabinetry that is already in place.