A small needle, size 60/8, is suitable for sewing silk.
a 7
You use size B.use a 7 to 9 mag
21 gauge
the pointed side
Butterfly needles
That would all depend on the size and the intricacy of what you are doing.
a hollow needle. Pretty much what you see in hospitals and such. The size depends on whichever one you ask for.
a specially needle is used. the common size for the needle is 14 g, and sometimes they use a 16 g if you don't want the hole to be so large
Yes, the larger the gauge the smaller the needle size.
Sewing by hand, I would use a Sharps Size 8
22G 1"