I am unsure about hte salt off the top of my head, however with the second question it should read something to the degree of per cubic meter. In which case everything but water as far as we can tell would agree with the statement. However, water being as it is, expands upon becoming a solid therefore when water is a liquid it "weighs" (or contains more of itself) inside a cubic meter. However if the question is really as simple as it is stated then the only answer is nothing.
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Success is not the key to happiness. Happiness is the key to success.-Albert Schweitzer, philosopher, physician, musician, Nobel laureate
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