Where do you purchase one that can be left on for long periods of time? I want to be sure if my fiance leaves the thing on overnight, we won’t burn the entire house down! My friend told me about the base of your salt lamp really matters. Wood doesn’t do so good, but having a steel base helps to absorb moisture and its safe to use for long periods of time. There’s so many brands out there manufacturing these, so be sure to look out for a steel base!
We have a lot of experience with observing ions. What we did with the lamp, since it’s supposed to make negative ions, was to place it adjacent to the inlet and, just by itself, we observed no ions at all. We turned it on and looked for negative ions. We looked for positive ions. We waited for the lamp to heat up. The bulb inside eventually does heat the rock salt, but we didn’t see anything.
The structure aspect is important, says Beauchamp. One way to get crystals to generate ions is to alter the shape of its crystal structure via temperature, something that can happen if a crystal structure is asymmetric. He points to a crystal called lithium tantalate, which changes its crystal structure when heated up in such a way as to create areas of high and low electrical potential when heated or cooled. This property allows it to generate an electric field that could, in theory, ionize the air around it. Sodium chloride’s chemical structure is a symmetrical cube that does not have the capability to generate high electric fields in the vicinity of a crystal.
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