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Microwave heating


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Microwave heating

  1. 1. Microwave Heating
  2. 2. Microwave ? A type of Electromagnetic wave Frequency 400MHz – 20000MHz Can be absorbed by water, fat or sugar in foods Can convert into Heat
  3. 3. How Microwaves preserve foods? Foods contain water ,sugars and fats Microwaves can be absorbed into them For Foods 915MHz – 2450 MHz
  4. 4. Contd.. After absorption …………  Microwaves  oscillations of polar molecules Energy  Heat  Heat can preserve foods
  5. 5. Microwave oven Creates radio waves at 2.45 GHz This waves propagate towards matter inside the oven Waves vibrate polar molecules Heat generates within the matter Works until door is opened or timer reaches zero
  6. 6. How make it real
  7. 7. Benefits Save time Easy to heat foods Retain Nutrients and vitamins Easy to clean Automated Prevent “Browning”
  8. 8. Disadvantages Loss some beneficial chemicals No crust formation Dense foods do not cook evenly Foods with lower water content toughened Cause cancers