why scientist havent invented a microwave for colding instead of heating????????????

Answer 1

Actually scientists have used lasers for cooling. Somebody got the Nobel prize in 1997 for it.

http://nobelprize.org/nobel_prizes/physics/laureates/1997/illpres/index.html

As you know laser and microwaves are both electromagnetic radiation, so I think it is a fair comparison.

They point several lasers into a small gas filled container, from different directions. The wavelength of the light has to be slightly longer than is needed, to excite the atoms of the gas. When an atom moves towards the light, the Doppler effect makes the wavelength of the light, seam shorter to the atom and the atom captures a photon. When a photon is captured, the atoms speed will slow, because of the momentum carried by the photon. The photon is then emitted in a random direction and does not statistically effect the atoms speed. Light that is not moving towards the atoms motion will not have enough energy to excite the atom, so it will just pass by.

Answer 2

Hmmmm, I don't think that is going to work. First temperature of an object is a measurement of mechanical vibrations at the molecular level. Laser have been used to cool gases by slowing the bouncing around of individual molecules. I don't think that would work on a solid.

Bottomline is only heat/energy exist, cold is just the lack of energy. Building a microwave that cooled would be a little like building a flash light that shined darkness.

There is an electronic device that cools using the Peltier effect (sorry about the spelling). It basically works on the same principle as a thermocouple instead of generating a current a current is forced and this creates a cold and hot junction.

They make solar powered portable coolers that use this principle.

Answer 3

You may be able to use a microwave to cool substances but there are many limitations. If the substance is a gas, you can use a Maser (Microwave laser) to cool it a certain amount.

If the substance is a solid, cooling is much more difficult. At this point we only know how to cool a few different types of solids with radiation.

Research is presently being done on laser cooling of solids in several labs, most notably Los Alamos National Lab.

Answer 4

Because microwaves heat up food by agitating the molecules causing them to move and therefore create friction which generates heat (try rubbing your hands together). Cooling requires the removal of heat and thereby slowing down molecules and so far the only machine that can do that is external, i.e. the ice box!

Answer 5

Good question!Microwaves excite the water molecule therefore heating up food.That is why dry objects dont heat up well like a cracker or a bisquit(dont know why you would want to heat a cracker, its an example only).I guess if microwaves could cancel out or slow a water molecules normal vibration it would cool it.Excellent question though!Good day!

Answer 6

Because cooling is done by the removal of heat. Microwaves work by vibrating fat sugar and water molecules. Once the molecules vibrate the kinetic energy of the vibration has been converted to heat energy, you can't convert heat back to undo to kinetic energy. So the only way to cool faster is basically to remove the heat faster or - use a colder temperature.

Answer 7

becaue microwaves are energy and energy heats things up by making the molecules excited so they move faster. Cooling things down would mean slowing the molecules down. You can't do that as easily as shooting some rays at stuff.

Answer 8

On a molecular level, heating and cooling are totally different. PS: If you want to chill something REALLY fast, try those CO2 fire extinguishers. Works great on 6-packs of beer!!!

Answer 9

Cooling is the process of removing energy and heat is the process of adding energy. You can't remove energy by adding it. Waves have energy.

Answer 10

because to quick chill would require the use of liquid nitrogen. And liquid nitrogen cannot be in the hands of john q public.