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How is a Microwave Built? Microwave ovens have brought household convenience to a whole new level. They can be put in wall cabinets or on top of kitchen islands. They are also manufactured from a variety of materials. In 1940, the cavity magnetron tube emitting microwaves was invented at Birmingham University in England. Percy Spencer discovered that this device could heat food after he watched corn pop, and eggs cook. Raw Materials Microwave (MW) heating is growing in popularity in the material processing industry due to its inherent advantages like faster heating and uniform heating. Its non-contact nature, low energy consumption, and speedier heating are additional advantages. Heating with MW is used in various engineering materials such as ceramics, metals and composites. Recently, it has been modified for bulk metal joining, cladding of dissimilar metallic powders on metallic substrates, as well as casting. The primary raw material used in microwave ovens is metal that is extracted from earth by extraction and mining processes that consume huge amounts of energy and create greenhouse gases. The second major material is plastic, which comes from natural organic substances such as cellulose and crude oil. The production of plastic produces indirect greenhouse gases because of the use fossil fuels for electricity and heat, and direct emissions from chemical processing like the production of Bisphenol A and phthalates. Once the raw materials have been procured, they are subjected to rigorous manufacturing and quality controls in order to meet strict federal standards. During the manufacturing process there are various emissions and wastes such as solvents dust and oils, are produced. The final product will then be shipped to retailers and ultimately to the consumer. The majority of microwaves are shipped via truck. This also uses lots of energy and generates greenhouse emissions. After purchasing a microwave, it will often be used for a few years before it becomes obsolete and is removed. Microwaves last a limited time therefore recycling and end-of life disposal options are essential to reduce the amount of waste and emissions. Design Microwave ovens cook food by emitting microwave radiation which is a type of non-ionizing electromagnetic waves with frequencies in the microwave spectrum of the electromagnetic spectrum (300 MHz to 300 GHz). The microwave oven cooks food by passing radiation through it. The microwave ovens are designed to shield against harmful effects of the radiation, like arcing that could damage the oven and the food it contains. There are various types of microwave ovens available on the market, each having its own advantages and disadvantages. Think about the size of your kitchen, its size and your cooking needs when choosing the right microwave. If you have limited counterspace you may want to consider a built-in model that is hidden behind a cabinet. The process of designing microwaves begins with acquisition of raw materials, which are then processed to create the various parts of the oven. The oven cavity and frame are two of them, as are the turntable, glass tray and magnetron tube that includes transformer and capacitor. The casing is composed of metals like galvanized or aluminum steel or brass. The microwave is packaged and tested following the assembly. The packaging is typically made of recycled materials, like cardboard and paper, or recyclable plastics, such as acrylonitrile butadiene styrene, polyethylene terephthalate, or polyvinyl chloride. The new microwaves are loaded onto transport tools such as ships, planes or automobiles. These tools use fossil fuels to convert chemical energy into mechanical energy, which is used to move microwaves from their location to the users. After the microwaves are delivered and plugged in by the user and utilized. This is the most energy-consuming phase in the lifecycle, and produces emissions such as carbon dioxide. Manufacture Microwave ovens are among the most popular appliances in modern kitchens. They are well-known for their speed and efficiency however, what exactly makes a microwave work? To find out, let's take an overview of the process of putting together this household staple. Metals, plastic parts, and other electrical parts are the primary materials needed for the production of a microwave. Some of these materials can be found in the earth, while others require processing. The process of manufacturing also requires the use of energy, which results in the emission of greenhouse gases. The impact on the environment of microwaves is in large part due to this stage of production. During the manufacturing phase, most of the material is assembled using automated machines. The assembly takes place in a factory where workers are working on the conveyor. Workers utilize a machine to shape sheet metal into the door and outer case. After the frame is constructed it is washed with an alkaline cleaner to get rid of dirt and oil. It is then put together with screws and bolts to create a secure chassis for the inside cavity. When the chassis is built the magnetron and the other components are positioned. The magnetron emits microwaves which cause water molecules to warm up. During this time there are a number of potential risks to your safety, for instance the risk of plasticizers leaching into food products and the risk of the oven exploding if it is empty. The microwave is then thoroughly tested and inspected after it is assembled to ensure that it meets the standards of the federal government. Following this the microwave is packed for distribution to consumers. The transportation of microwaves between factories and retailers can result in a significant 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 radiation that is part of the electromagnetic spectrum of waves. The spectrum is comprised of different forms of energy that travel through space. They include visible light, radio waves, infrared radiation, and ultraviolet radiation. Microwaves can be used to heat food by a process called microwave heating. continue reading this.. uses electromagnetic radiation to cause the water molecules within the food to rotate and vibrate. This causes the food to be heated without heating the surrounding air or changing the physical structure of the food. Microwaving food is a safe method to heat foods because the microwave radiation doesn't affect the food's cells or cause it to become radioactive. Microwaves should not be used by those who wear pacemakers as they can interfere with electrical signals generated by certain electronic cardiac devices. Fortunately, this issue has been addressed by the use of special shielding. Bisphenol A (BPA), the phthalates and other chemical compounds present in microwave ovens may be detrimental to your health. BPA has been found to leach into food from plastic containers, and phthalates can be linked to increased risks of reproductive problems. Additionally microwave radiation can cause damage to the eye tissues and cause cataracts. The test procedures of the current NOPR stipulate that microwave ovens be tested in their microwave-only cooking mode and convection-microwave cooking modes in order to determine the energy consumption of the appliance during representative usage conditions. The test method makes use of mixtures of water and other basic food ingredients that are intended to simulate actual foods that are reheated in the microwave. The mixtures are then poured into glass containers made of borosilicate and then heated in a microwave oven, and later tested for thermal efficiency. Packaging Many microwave-ready dishes employ an exclusive method of packaging referred to as modified atmospheric packaging (MAP). This method of packaging utilizes oxygen-eliminating gases to prolong the shelf life of pre-prepared food items. These gases are usually made up of carbon dioxide or pure oxygen and nitrogen. They function by removing air from the food's environment. This prevents food spoilage and prolongs the shelf life of the meal. The MAP process is also used to make meat products, such as frozen steaks, chicken wings or beef patties. These packages are made of a nonwoven film that absorbs moisture and helps keep the food moist and fresh for a longer period of time. This type of packaging reduces waste by reducing amount of water and air that is lost during the heating process. When choosing a microwave, customers must be aware of the model's size and power level, as well as other features, like defrost settings, or sensor cooking. These features can make cooking more convenient, but it's important to consider the frequency at which these features will be used to avoid paying for an appliance with additional functions that will be inactive most of the time. Another factor to consider is the design of the microwave. Some models have an integrated flush design that fits seamlessly into existing cabinets.