Tilde spacing?

[Chris Clemens]

I am working on an electronics for scientists and engineers book that uses the ~ to indicate "poorly approximates". I have searched for a rule that governs how to space this symbol for the following expression.
~1 mA < |I| < ~10 mA

The logical operator symbol for ~ means "not" which is not how this is being used so I am unsure if this is to be treated as a sign of comparison like a normal double tilde approximation symbol is.

[dworthing]

I am checking

[Chris Clemens]

I don't think that this single tilde is being used as a comparison sign since, in the second instance in this example, it follows a "less than" sign. This tilde means “approximately” much in the same way the tilde means “not” in logic. (It is a qualifier here, not a sign of comparison.) I would braille it unspaced from the number to which it applies.

[dworthing]

Would you then use the number indicator when the Tilde is used, as it is here, to mean "approximately"?

DR

[dworthing]

If there is no space between the tilde and the following number it does not meet the criterion for requiring a numeric indicator. The number is not preceded by a space (or by a space and minus sign).

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