In my study material, there is a chart of the fundamental units. In that solid angle and angle are separated by a line from the other fundamental units. What is the reason for that?
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5You'd have to ask the author why they laid out the table like that. One possible reason is that angles are dimensionless because they are defined as ratios. – John Rennie Jun 04 '19 at 06:05
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@JohnRennie isn't any unit defined as a ratio? – Jun 04 '19 at 08:37
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1@santimirandarp no, e.g. the unit of length like 1 m is not a ratio: it's actual length of a reference object. – Ruslan Jun 04 '19 at 09:54
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My guess that it's to separate them from fundamental physical units. You can think of an angle of 5000 degrees or maybe an angle of 1,000,000 radians, they may be interpreted as rotation of how ever many rotations, but in either case they are not a fundamental (physical) units such as mass, force etc..
