Why grapes create plasma in a microwave: Scientists discover they trap electromagnetic radiation

Mail Online | 2/19/2019 | Press Association;Annie Palmer For Dailymail.com
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A pyrotechnic party trick that involves grapes bursting into flame in a microwave has been explained by scientists.

The trick, popular at science fairs and on YouTube, is performed as follows: Cut a grape into two halves joined by a small piece of skin and place in a household microwave oven.

Power - Spectacle - Fire - Erupts - Point

Switch on at full power and enjoy the spectacle as white hot fire erupts from the point where the two grape halves touch.

While many have sought to provide a scientific explanation behind the phenomenon, few have gotten it right - until now.

Study - Team - Scientists - Phenomenon - Molecules

A new study conducted by a team of Canadian scientists shows how the phenomenon is triggered by charged molecules containing sodium and potassium.

Scientists used a combination of thermal imaging and computer simulations of electromagnetic fields to explain the physics behind why sparks are generated from microwaved grapes.

Experiments - Hydrogel - Beads - Computer - Simulations

Experiments with water-based hydrogel beads and computer simulations revealed that the joining piece of skin does not play an important role, as was previously thought.

Electromagnetic resonance led to concentrated spots where the 'ionised' molecules generated a plasma, a super-hot electrically conductive gas.

Ability - Water - Microwaves - Formation - Spots

The ability of water to absorb microwaves contributed to the formation of the 'hot spots.'

Put simply, the microwaves were being trapped in so-called cavities between the grapes.

Grapes - System - System

'If you take two of these grapes and bring them close to each other, what happens is you don’t have an independent system anymore, but you do have a system where those two – we call them...
(Excerpt) Read more at: Mail Online
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