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Can a microwave oven really reduce Epsom salt crystals to powder?

We heard that a bowl of Epsom salts placed near a microwave or TV reduces microwave emissions, and these cause the crystals to turn to powder over time. This sounds like an urban myth, but we tried it.

To our surprise, the salts turned to powder within a week or two. Why does this occur? Are microwaves really involved?

Arlene Dowling, Australia

(Image: grz3gorz, stock.xchng)

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Last edited on: 2010-03-17 13:19:38

Categories: Domestic Science, Technology.

Tags: microwave, crystal, Epsomsalt, powder.

 

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kleer001 says:
I think the ambient heat and humidity in the air would have more effect than radiation from a shielded microwave.
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posted on 2009-06-17 18:48:29 | Report abuse


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kleer001 says:
The real test would be to place similar bowls of the salt in different places: outside in the shade, outside in the sun, in a cool dark place inside, in the bathroom, etc... Check the bowls in the morning and the evening. Keep lots of notes and let us know what happened.
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posted on 2009-06-17 18:50:21 | Report abuse


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Simon says:
Did you try it INSIDE the oven with it switched on?If that DOESN#39;T do it, you know it#39;s NOT an effect of the microwaves.:-)Simon
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posted on 2009-06-18 13:13:48 | Report abuse


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Puckoon says:
Epsom salts (Magnesium sulphate) is a salt which is capable of existing with various degrees of hydration. In high humidity it will absorb water to the extent that it is liquid and in dry or hot environments it will lose water and become dry and powder like. It has nothing to do with microwaves or TVs and everything to do with the environment. You can of course heat and dry Epsom Salts in a Microwave because of its high moisture level.
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posted on 2009-06-19 00:24:15 | Report abuse


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Anonymous says:
I know that this salt is a major absorbent of sound waves in sea water. It turns the sound waves into heat. Perhaps it reacts the same way when exposed to these devices that produce microwaves.
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posted on 2009-06-21 10:11:38 | Report abuse

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labsnark says:

No, it doesn't.  Common salt barely absorbs microwaves at all, and the same is true of magnesium sulphate (epsom salt).  Generally, to get microwave heating, you need either a conducting or semiconducting solid or liquid, or solid or liquid with mobile electric dipoles (water, ethanol, tetrahydrofuran, for example) whose relaxation time is of the order of 10^-9 seconds.  The microwave field can interact with the mobile charges in either of these broad categories.  Salt/epsom salts don't come into either category. 

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posted on 2009-08-10 08:53:07 | Report abuse


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