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Wine grapes and Plasma bolts

A cutaway Weitraube in a microwave oven, the result is flashes of luminous Plasma. A Plasma particle is a mixture of electrically conductive ions and electrons.

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Wine grapes and Plasma bolts
A cutaway Weitraube in a microwave oven, the result is flashes of luminous Plasma. A Plasma particle is a mixture of electrically conductive ions and electrons. Decisive for the effect seems to be that the irradiated objects are linked to each other - so Hotspots can arise. the

Everything you need for the Radio tower in the own microwave, is a bunch of grapes. In the popular Do-it-yourself Experiment, the grape is halved, so that a fine skin bridge the two halves. After a few seconds in the microwave is a miniature-fireworks of flashing Plasma to admire.

For about twenty years, this effect is known and has been widely documented in Videos. What physical mechanisms lie behind the radio stiebenden fruit, was as yet unclear. Canadian researchers Aaron Slepkov of Trent University in Peterborough have solved this puzzle now.

your magazine PNAS study, which was published, according to the round shape of the grapes and the properties of water are crucial. Previous explanations for this phenomenon have always emphasized the role of the skin and the open, wet surface, in the formation of the plasma, the researchers write. "We note, however, that none of these components for the formation of the plasma is essential."

The term Plasma refers to a particle mixture in which in addition to neutral atoms and charged particles such as ions or electrons, so free charge carriers. Plasma can be generated, for example, by the Heating gases. A closer look at the development of plasma lightning show, the researchers write in their article that the ignition is below the skin bridge between the two grape halves.

First of all, the researchers concluded that whole grapes and balls of the Hydrogel, for the most part consists of water, plasma flashes can occur when they are irradiated with microwaves. It is crucial that there is a contact between the grape or bullets.

The Experiment also works with quail eggs

Slepkov, and colleagues investigated by means of thermal imaging camera and the computer simulation of the heat distribution in grapes from the plasma flash. This showed that between the grapes "Hotspot".

According to the findings of researchers, the so-called Mie scattering, a scattering of electromagnetic waves in round objects, for the Hotspots. An important role is also played by the dielectric constant of water, which indicates how permeable to water and to electric fields.

in Order to show that the content is decisive, and not the surface, the researchers are two in contact with the furnace at the end of quail eggs in a microwave. It is a Hotspot showed up at the point of contact. This Hotspot, there was not, when the eggs had been emptied by a small hole. The scientists filled shells of the eggs with water, was to re-create a Hotspot.

A spectral analysis of the plasma flash has on sodium and potassium, chemical elements, which are in the grape skin. Because the electric field of the microwave radiation is strongly concentrated in the contact point, are ionized, these atoms partially. The sodium - and potassium-ions with the wavelength of the microwaves in resonance and can also ionize the surrounding air, so that a Plasma is created.

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