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https://www.ovensandhobs.uk/products/russell-hobbs-25l-built-in-combination-microwave

How is a Microwave Built Microwaves have taken household convenience to a new level They are designed to fit inside wall cabinets or on top of kitchen islands They are also manufactured using a variety of different materials The cavity magnetron tube emitting microwaves was first invented in 1940 at Birmingham University in England Percy Spencer discovered that this device could cook food after watching eggs pop and corn cook Raw Materials Microwave MW heating has been gaining immense popularity in material processing due to its inherent advantages such as faster heating uniform heating noncontact and low energy consumption Heating with MW can be applied on a wide range of engineering materials including ceramics metals and polymers Recently it was adapted for bulk metal joins the cladding of metallic powders that are not similar to each other onto metallic substrates and casting Metal is the most important raw material used in microwave ovens It is extracted from the earth using processes that consume lots of energy and produce greenhouse gases Plastic is a second important component and is made up of organic compounds like cellulose and crude oils Plastic production produces indirect greenhouse gases due to the use of fossil fuels to generate heat and electricity and direct emissions from chemical processing like the production of phthalates and Bisphenol A After the raw materials are acquired they are subjected to rigorous manufacturing and quality controls to meet strict federal standards During this process a range of emissions and wastes are produced such as oil solvents dust fumes and dust The final product is then shipped to retailers and then to consumers The majority of microwaves are shipped via truck This requires a lot of energy and produces greenhouse emissions After purchasing a microwave it is typically used for several years until it becomes outdated and taken away Since the life span of microwaves is limited recycling and endoflife disposal options are critical to reduce emissions and waste Design Microwave ovens cook food by emitting electromagnetic waves in the microwave region 300 MHz to 300 GHz The microwave oven cooks food by passing the radiation through it The microwave ovens are designed to protect against harmful effects caused by radiation such as radiation arcing which could harm the oven as well as the food that is cooked inside There are different types of microwave ovens that are available on the market each with distinct advantages and disadvantages When choosing a microwave be sure to consider the size of your kitchen and also your cooking needs If you have limited counterspace think about a builtin model that hides the appliance The design of a microwave oven begins with the purchase of raw materials They are then processed into the various parts These include the oven frame and cavity turntable glass tray magnetron tube with capacitor and transformer diode waveguide and electromechanical components motors relays switches and motors The casing is typically constructed from metal including galvanized steel aluminum or brass The microwave is packaged and tested after the assembly The packaging is typically comprised of recycled materials like cardboard and paper or recyclable plastics such as acrylonitrile butadiene polyethylene terephthalate polyethylene terephthalate and polyvinyl chloride The new microwave is transferred to transportation tools such as ships airplanes or automobiles These tools make use of fossil fuels to convert chemical energy into mechanical energy which is used to move the microwaves to the consumers After the microwaves are delivered they are then plugged into the users This is the most energyintensive phase in the lifecycle and results in emissions such as carbon dioxide Manufacture Microwave ovens are among the most popular appliances in modern kitchens They are wellknown for their speed and convenience however what exactly is it that makes the microwave function Lets examine how to assemble this staple of the home Metals plastic parts and other electrical parts are the essential raw materials to manufacture a microwave These can be obtained from the earth but certain require processing to make them The process of manufacturing also requires energy consumption resulting in greenhouse gas emissions This phase of production is the main cause of a microwaves environmental impact In the manufacturing phase the majority of the material is assembled by automated machines The assembly takes place in the factory where workers are placed on the conveyor Workers use a machine to making sheet metal into the outer casing and door After the frame is constructed it is rinsed in an alkaline cleaner to get rid of oil and dirt It is then assemble using bolts and screws to create a safe chassis for the inside cavity Once the chassis is formed after which the magnetron and other components are positioned The magnetron emits radio waves that cause water molecules to heat up During this phase there are security risks like the possibility that plasticizers will be released into food items or the oven could explode when it is empty After the microwave has been constructed it goes through rigorous testing and inspection to make sure that it is in compliance with federal standards After this step the microwave is packed for distribution to consumers Transporting microwaves from the factory to retailers could be an environmental burden The transport equipment used to deliver the microwaves use fossil fuels that release carbon dioxide and other greenhouse gases into the atmosphere Testing Microwaves are electromagnetic radiation that forms part of the electromagnetic wave spectrum The spectrum is comprised of various forms of energy that travel through space This includes visible light radio waves as well as infrared radiation and ultraviolet radiation Microwaves heat food by using the process of microwave heating ovensandhobs makes use of electromagnetic radiation to cause the water molecules to spin and vibrate This allows the food to be heated without heating the air around it or changing its physical structure Microwaving is a secure method to cook food because microwave radiation doesnt damage cells of the food or cause them to become radioactive However those with pacemakers should avoid microwaves because the radiation could disrupt the electrical signals of some electronic cardiac devices This problem has been solved by using special shielding Certain chemicals used in microwave ovens can be harmful to health such as bisphenol A BPA and phthalates BPA has been found to leach into food from plastic containers and phthalates could be associated with increased risk of reproductive issues In addition microwave radiation may cause damage to the eye tissues and cause cataracts In todays NOPR tests the procedures require that microwaves be tested in their microwaveonly cooking mode as well as convection microwave cooking modes in order to determine the energy consumption of appliances in realistic conditions of use The test procedure uses water and basic ingredients to simulate food that can be reheated using the microwave The mixtures are then poured into a borosilicateglass container heated up in the microwave and measured for thermal efficiency Packaging Many microwaveready meals use special packaging techniques called modified atmosphere packaging MAP This packaging method makes use of oxygeneliminating gases to extend the shelflife for food items that are preprepared These gases are typically composed of carbon dioxide pure oxygen as well as nitrogen They operate by removing oxygen from the foods surroundings This stops spoilage and extends the shelf life of the food for the consumer The MAP process is also used to make meat products including frozen steaks chicken wings or beef patties The packages are made up of a nonwoven material that absorbs moisture and helps keep the food fresh and moist for longer This type of packaging also reduces waste by reducing the amount of air and water that is lost during the heating process When deciding on the right microwave consumers should take into consideration the size and power level as along with other features such as defrost settings or sensor cooking These features can make the cooking process more efficient but its essential to think about how often they are used in order to avoid spending money on a microwave that has additional features that will sit dormant most of the time Another factor to consider is the design of the microwave Certain models come with a flushbuiltin design that can fit seamlessly into existing cabinets