How a Microwave
How do microwaves cook food?
Foods generally contain water in a high proportion. Water is composed of polar molecules. This means that we can consider the water molecule as a structure with two poles at the ends, one positive and one negative.
The water molecule is polar: it has poles.
Microwaves are able to pull the poles of polar molecules, forcing them to move.The direction in which the molecules pull microwave switches 2450000000times a second. This interaction between microwave and polar molecules causethe rotation of these.
Microwaves rotate more or less efficiently to other polar molecules that are inaddition to water food. Microwaves however have no effect on non-polarmolecules (without poles), for example plastics. Neither have an effect on polar substances in the particles that form non-motile. This group would be solid water,common salt, porcelain or glass,
Once the water molecules in food begin to spin, they can transfer some of this energy by collisions with neighboring molecules. This conduction mechanism willfinish all the food warm.
The frequency (n) and wavelength (l) of an electromagnetic wave are related as follows:
c = l • n
where c is the speed of light.
Foods generally contain water in a high proportion. Water is composed of polar molecules. This means that we can consider the water molecule as a structure with two poles at the ends, one positive and one negative.
The water molecule is polar: it has poles.
Microwaves are able to pull the poles of polar molecules, forcing them to move.The direction in which the molecules pull microwave switches 2450000000times a second. This interaction between microwave and polar molecules causethe rotation of these.
Microwaves rotate more or less efficiently to other polar molecules that are inaddition to water food. Microwaves however have no effect on non-polarmolecules (without poles), for example plastics. Neither have an effect on polar substances in the particles that form non-motile. This group would be solid water,common salt, porcelain or glass,
Once the water molecules in food begin to spin, they can transfer some of this energy by collisions with neighboring molecules. This conduction mechanism willfinish all the food warm.
The frequency (n) and wavelength (l) of an electromagnetic wave are related as follows:
c = l • n
where c is the speed of light.
Educational Material extracted from:
http://www.taringa.net/posts/info/1163967/Sabes-como-funciona-el-microondas_.html
The microwaves are electromagnetic waves of ultra-short length, hence the"micro". Its wavelength is in the order of centimeters and work according to what he said Tran, ie by vibrating water molecules contained in food.
That vibration is so fast that, as we all know, the friction releases energy, so you can say that food is "cooked themselves", as heat is generated in the same cell nucleus.
The waves move into the shielded space of the device, so you can not go outside and bounce off walls continuously. As the plate is rotating above the food, the waves penetrate the cells with different angle, so that the whole food is cooked evenly.
From the outside you can see how the food is cooking, or heating a liquid,because the door has a metal grid, which can see through the small holes, but it makes electronic display to the waves, preventing them go abroad and we might damage.
I must say that if the food in question has no water or have poorly, the microwavewill not fulfill its mission properly, because as I said, the foundation is the vibration of water molecules in the product to cook or heat . This explains why thedish containing the food is not heated, and if so is by simple heat transfer from the food above it.
Material extracted from: http://www.mentesinquietas.es/blog/?p=153#comment-197
That vibration is so fast that, as we all know, the friction releases energy, so you can say that food is "cooked themselves", as heat is generated in the same cell nucleus.
The waves move into the shielded space of the device, so you can not go outside and bounce off walls continuously. As the plate is rotating above the food, the waves penetrate the cells with different angle, so that the whole food is cooked evenly.
From the outside you can see how the food is cooking, or heating a liquid,because the door has a metal grid, which can see through the small holes, but it makes electronic display to the waves, preventing them go abroad and we might damage.
I must say that if the food in question has no water or have poorly, the microwavewill not fulfill its mission properly, because as I said, the foundation is the vibration of water molecules in the product to cook or heat . This explains why thedish containing the food is not heated, and if so is by simple heat transfer from the food above it.
Material extracted from: http://www.mentesinquietas.es/blog/?p=153#comment-197
A microwave oven converts electrical energy (Microwave, ie electromagnetic waves whose frequency is between 300 MHz and 300 GHz (according to somedefinitions), the point is that water molecules, this being a polar substance, is ie each of their molecules behave like a small magnet and has a negative and apositive start to vibrate and collide reacting to the magnetic field generated by microwaves, thus the fact that the water is heated by friction and collisions ofmolecules, as well as the rupture of hydrogen bonds.
Then, the second law of thermodynamics, heat is transferred from water to other components of food having so dinner ready.
Educational Material extracted from:http://www.ikkaro.com/Microondas-Funcionamiento
Then, the second law of thermodynamics, heat is transferred from water to other components of food having so dinner ready.
Educational Material extracted from:http://www.ikkaro.com/Microondas-Funcionamiento
The operation is simple:
Water is a polar substance, and therefore its molecules are dipoles, ie applyinga magnetic field on them will cause a change in orientacón and position.
The microwave electromagnetic field that creates, causing the water dipolescollide with each other, so that friction is achieved by heating the liquid element.
Therefore all foods are heated, as they are lesser or greater degree made by water.
The walls of the microwave are metal to cause electromagnetic waves bounce, reaching directly to the food.
Also you can make many experiments with a microwave, like putting benzene,apolar substance in a microwave oven and see that is not heated, or put a light bulb and see what goes on inside him, though the latter is better not to because it is extremely dangerous for the welfare of the microwave, as the bulb may endreventandá
Material extracted from: http://www.microplagio.com/articulos/como-funciona-un-microondas/
Water is a polar substance, and therefore its molecules are dipoles, ie applyinga magnetic field on them will cause a change in orientacón and position.
The microwave electromagnetic field that creates, causing the water dipolescollide with each other, so that friction is achieved by heating the liquid element.
Therefore all foods are heated, as they are lesser or greater degree made by water.
The walls of the microwave are metal to cause electromagnetic waves bounce, reaching directly to the food.
Also you can make many experiments with a microwave, like putting benzene,apolar substance in a microwave oven and see that is not heated, or put a light bulb and see what goes on inside him, though the latter is better not to because it is extremely dangerous for the welfare of the microwave, as the bulb may endreventandá
Material extracted from: http://www.microplagio.com/articulos/como-funciona-un-microondas/
What really makes the 2.4GHz radiation is used in microwave excitation of theOH bond. This link is present mainly in the water, but also in many other compounds. The ease of this link is more exciting if H is relatively "free"hydrogen bonds without the "attention", this happens on the ice and in some hydrocarbons.
Referring to excitation of the OH bond does not mean that the molecule rotates,just to absorb the microwave energy passes link the fundamentalrotational-vibrational state to a higher "excited." This new state contributes to higher average translational energy of molecules (as microscopic) and thus its temperature (measured macroscopic). (Physical Chemistry Vol.2 Cap. 21 Aut: Ira N. Levine)
Some features:
If a food does not contain OH bonds, is not heated. So most do not heatempty plates.
To heat something dry, water must be added.
The dehydrated or do the cooking of food beyond its heating (to the point of roasting or burning) can trigger damage to the microwave
The heat is produced where polar molecules moving, ie it can be inside of a potato. Heat flows, as in conventional ovens, outside in the food but the outdoor area is far greater.
Never put anything with liquid seal, like a raw egg in shell, or a closed glass container. The effect is that water is heated to become steam, which expands,causing great pressure, but could explode.
Due to some frequency microwave ovens can interfere with Wi-Fi signalsand Bluetooth also works in the range of 2.4GHz
Referring to excitation of the OH bond does not mean that the molecule rotates,just to absorb the microwave energy passes link the fundamentalrotational-vibrational state to a higher "excited." This new state contributes to higher average translational energy of molecules (as microscopic) and thus its temperature (measured macroscopic). (Physical Chemistry Vol.2 Cap. 21 Aut: Ira N. Levine)
Some features:
If a food does not contain OH bonds, is not heated. So most do not heatempty plates.
To heat something dry, water must be added.
The dehydrated or do the cooking of food beyond its heating (to the point of roasting or burning) can trigger damage to the microwave
The heat is produced where polar molecules moving, ie it can be inside of a potato. Heat flows, as in conventional ovens, outside in the food but the outdoor area is far greater.
Never put anything with liquid seal, like a raw egg in shell, or a closed glass container. The effect is that water is heated to become steam, which expands,causing great pressure, but could explode.
Due to some frequency microwave ovens can interfere with Wi-Fi signalsand Bluetooth also works in the range of 2.4GHz
Material extracted from:http://es.wikipedia.org/wiki/Horno_de_microondas
Image extracted from:http://es.wikipedia.org/wiki/Archivo:Microwave.750pix.jpg
Video extracted from:http://youtu.be/hdCUhUun--c
No hay comentarios:
Publicar un comentario