Microwaves penetrate food

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Microwave is an effective means to deliver energy to food through polymeric package materials, offering potential for developing short-time in-package sterilization and pasteurization processes. The complex physics related to microwave propagation and microwave heating require special attention to the design of process systems and development of thermal processes in compliance with regulatory requirements for food safety. This article describes the basic microwave properties relevant to heating uniformity and system design, and provides a historical overview on the development of microwave-assisted thermal sterilization MATS and pasteurization systems in research laboratories and used in food plants.

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If you answer yes to any of these questions, you likely own a microwave. Microwaves provide an incredibly quick and efficient method of heating foods. Next time you have, say, minutes to spare, you can reflect upon the physical phenomena that heats your hot pockets, pops your popcorn, and requires minimal human input.

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Cooking in general does reduce the nutritional value of food, but by how much and is your microwave that much worse? By Kenny Lomas. Cooking, in general, destroys some vitamins.

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Heat transmitted by electromagnetic waves for cooking. Microwaves are very short in length radio frequency waves and are produced by a special generator in the oven called a magnetron. The waves' frequency is tuned to the vibrating frequency of water. These waves are then distributed throughout a metal cavity and in some ovens, the food rotates on a revolving shelf.

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Last updated: July 17, H ow our ancestors would have loved microwave ovens! Instead of sitting around smoky wood fires for hours on end, boiling up buffalo stew for their Stone-Age friends, they could have just tossed everything in the microwave, pressed a few buttons, and had a meal ready in a minute or two.

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When using a microwave to heat baby milk [1] was banned in the USA [2]it sent a clear message: this device is potentially dangerous [3]. But the fear of microwaves nevertheless remained. Microwaves had been banned from use in the USSR [4]which was repealed only after the change of regime due to the risk of cancer.

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It targets years old high school and college students to improve their scientific literacy in everyday life. Other than most popular science shows that only leaves short time impression. We not only want science to be fun and attracting, but also want people truly learning.

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One such myth really stands out because it seems so incredible. Many, many people believe that microwaves cook food from the inside out. They have been told that the microwaves penetrate the food to the center, and beginning exciting the water molecules to produce heat, and then this heat moves outwards to cook the rest of the food. Or Something like that?

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By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. It only takes a minute to sign up.

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Reported by Ms. Besides ionizing radiation introduced in the previous two issues, microwaves are another form of radiation that is commonly used to control foodborne pathogens. Microwaves are a form of electromagnetic energy like radio waves and sunlight. They are generated by electricity and capable to pass through glass, paper, plastic, and similar materials.


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