It means that the speed of light in that medium is the same as in vacuum. This is ALMOST the case for stuff like "air". If you measure closely enough, it is only true for vacuum, all other materials have an optical density > 1.
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It is 1.
1 gram (approx)
If you meant 'If 1 is equal to 10 then 100 equals to what?' then the answer is: 'any number'.
Density = 1 lb/1 pt = 453.59 g/568.26 mL = 0.798 g/mL
If you meant 2x+3=4x²x=(1±√(13))/4x1≈1.151387818866x2≈-0.651387818866