I used a consumer-grade scale that's accurate to 100mg and shook my shaker over it until it went up by 100mg. I repeated this about 4 times, and also did a few tests with larger amounts. They were all in close agreement that there are 8-10 shakes in 100mg, meaning that 1 shake is 10-12.5mg.Salt is 40% sodium by weight, so a shake contains 4-5mg of sodium. My salt shaker has 5 holes and was using fairly coarse pink salt. Yours may vary by quite a lot.
Alternate response: I was trying to find this out and couldn't, so I experimented. At a very rough estimate, it took 200 or so shakes to fill a teaspoon. Using that figure, a single shake would have ~12 mg of sodium.
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It depends on what salt shakers you are talking about...some are made of plastic, but alot of salt shakers are made of glass.
Standard table salt is primarily sodium chloride.
Iodized salt also contains sodium iodide.