How does Microwave oven heat food?
Isn't it amazing how microwave oven heat food quickly & evenly from inside to outside without using any heating device unlike conventional oven?
Ever wondered how this happens?
It's MICROWAVES
Food of the kind mentioned above are mostly made up of weak bonds like Hydrogen bonds. These bonds have opposite charge on either ends of the molecule. Since microwaves change its electromagnetic field rapidly( 2.4 billion time per second for a wave of 2.4GHz) molecules in food tend to rearrange themself with electromagnetic waves when these waves are passed on them. This creates molecules to move move rapidly and this generates FRICTION & friction produces heat & heats up the food
Next time you use a microwave oven the only thing you need to worry is
Ever wondered how this happens?
It's MICROWAVES
The Heating waves
Now that you know that microwaves heat food(which your bright heads already knew) but, how does microwaves heat food and what are microwaves?
Microwaves are electromagnetic waves just like Sunlight. Similar to how sunlight heat our body when exposed to it, microwaves do the same to the food but, not exactly the same.
Microwaves only heat sugar, water & fats. With frequency of 2.45 GHz it passes through plastics, ceramic, glass, et cetera. Metals on the other hand reflects microwaves and food absorbs microwaves and is heated up.
Containing microwaves
If microwaves are let to radiate in our living room
they may end up buring our skin. It's not a good idea to use microwave in an open space. To avoid harm to human and to utilise maximum energy of microwaves we contain them in a closed cavity. This is done by coating inner walls of oven by metal and the oven door is glued with metal mesh to avoid microwave escape. As metals reflect microwaves they are used in inner walls of microwave oven (aluminium metal is usually used).
Magnetron : The heart of the microwave oven
Magnetron is the device which converts electrical input to microwaves. Although Magnetron sounds like a big bad decepticon it's a small device. It consists of 2 permanent magnets with opposite poles on either sides of a vacuum tube.
When alternating current is passed in vacuum tube microwaves are produced with the help of magnetic field created by the permanent magnets. With the help of wave guide electromagnetic waves of frequency 2.45GHz i.e microwaves are directed outwards and heats your 2 days old pizza and makes you feel as if you ordered it 2 minutes ago.
P S please throw that pizza away.
Microwaves are harmless as they are non-ionizing waves. Microwaves preserves mostly all nutrients except for those which are heat sensitive
4.5/5
ReplyDeletethanks for information broda��
ReplyDeleteI heard that pregnant women are not supposed to spend more time near microwave is that true?
ReplyDeleteMicrowaves would harm(burns due to waves) humans only when one is exposed to the waves. Microwave oven is so made that microwaves don't escape the cavity(an old microwave oven could leak out few microwaves). Though it was observed that some nutrients of breast milk were lost. It is fine to use microwave even when someone is pregnant but do NOT microwave the breast milk. I personally suggest that if someone is pregnant it is better to consume fresh and live food as much as possible and avoid reheating and consuming lefovers
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