Best Answer

The heat from a oven is slowly passed into the bread and the substance holds the heat upon removal relative to the time of heating. For a microwave, the substance is artificially raised in temperature from the outside in. As soon as the heat is stopped, the temporary warming stops and the core of the object is not as warm as the outer layers, pulling the heat inward. Cool replaces the heat as it goes inward. All liquids and food products, are made up of molecules. These molecules have positive and negative particles, so they tend to behave like microscopic magnets. As the positive half cycle of the microwave penetrates the food, the negative particles of the molecules are attracted and attempt to align themselves with this positive field of energy. Then, when the microwave energy alternates to the negative half cycle, the opposite occurs -- The negative particles are repelled and the positive particles are attracted, causing a flipping motion (actually, this reaction is the movement of the particles within each molecule, so, technically, they reverse polarity). This might be compared to a room full of people trying to run back and forth, from one side to the other. Obviously, there would be a lot of bumping, rubbing, agitation, and friction. Now, consider that the actual frequency of the RF energy used in microwave ovens is 2450 million cycles per second! Moreover, consider that within the course of one of those cycles, the molecules would actually change their direction (polarity) twice - once for the positive half-cycle and once for the negative half-cycle. This red-hot rate of vibration causes tremendous friction within the food, and - just as rubbing your hands together makes them warm - this friction produces heat. So the heat is produced directly in the food, but the food is not cooked, as is commonly believed, from the inside out. Actually, the cooking begins just beneath the outer surface and from there inward and outward, with the majority of the energy being expended in the outer layers. The rate and degree of heating depend on the depth and density of the food, as well as its ability to conduct heat. Because the microwave energy is changed to heat as soon as it is absorbed by the food, it cannot make the food radioactive or contaminated. When the microwave energy is turned off and the food is removed from the oven, there is no residual radiation remaining in the food. In this regard, a microwave oven is much like and electric light that stops glowing when it is turned off.

User Avatar

Wiki User

โˆ™ 2007-02-24 16:21:47
This answer is:
User Avatar
Study guides

Add your answer:

Earn +20 pts
Q: Why is it that breads heated with a microwave cool much faster than those heated with an oven?
Write your answer...
Still have questions?
magnify glass
Related questions

Why do particles grow bigger when they are heated?

Particles do NOT grow bigger when they are heated. The substances which are composed of those particles get bigger. That is because the particles move faster when they are heated and jostle each other further apart, so it's the spaces between them that get bigger.

What happened to Oroweat stuffing mix?

Oroweat no longer makes stuffing. Instead they make premium breads including those low in calorie and low in fat. They make specialty breads like Jewish Rye and whole grain breads.

Will a microwave affect a computer when the computer and microwave is on?

Yes, a microwave oven can interfere with electromagnetic equipment, like a computer. A microwave oven can also interfere with radio signals, like those used for wireless Internet and cell phones.

Contrast the changes in a crystalline solid as it is heated to those in an amorphous solid that is heated?

crystalline gets hotter then amorphous

In the electromagnetic spectrum the frequencies of visible light are between those of?

ultraviolet and microwave

What is the wavelength range of a microwave?

10 centimeters or less If you mean "microwave oven", those operate at the frequency of 2.45 GHz, where the wavelength is 12.24 centimeters.

What are the common ingredients of breads?

Bread contains only a few ingredients, but those ingredients vary depending on the type of bread. However, all breads contain some kind of flour, water, salt, and yeast.

Can you bake in a microwave?

Some things can be baked in a microwave. To me they do not look or taste the same as those baked in an oven. You must also watch the type of cookware used.

How do you run faster in a soccer game?

move you legs faster , and pump those arms .

What is function of waveguide in microwave devices?

It replaces a coax cable, which won't work at those frequencies.

Who knows how awesome a 1996 Saab 9000 aero is?

man its awesome. No Vws come faster stock, or nicer for that matter. With those leather heated recarro racing seats? forget about it. A few bmws are faster and close to as nice, but you dont see many actually driving around. Look out for m3's and m5's.

Which planets travel at a faster speed?

Those that are closer to the Sun.

People also asked