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It will depend on the type of yarn. 225 yards of worsted weight yarn is about 100g, but 225 yards of sock weight yarn is about 25g. What is the yarn type?
Worsted weight yarn would go great with plastic projects.
A very stiff type of yarn
Alpaca is a type of yarn. It is a fine wool from alpaca hair.
It depends very much on the bulk and type of yarn.
Solo yarn is a type of yarn with a worsted weight blend of silk as well as mohair with just a touch of wool.
Yarn dolls
Ring spun yarn is a type of yarn that is achieved by constantly twisting a rope of cotton fibers. This process significantly strengthens the yarn.
Twist is the spiral arrangement of the fibers around the axis of the yarn. it binds the fiber together and strenghten the yarn. There are tw type of twist one is "S" type and other one is "Z" Twist
A yarn in which one type of fiber is twisted or wrapped around another fiber that serves as a core.
in tech they have a certain apparatus called a woom for weaving fabric. eg. (yarn ect)
There is no hard and fast number that I could give you as an answer. It all depends on what the yarn is made of, what "weight" the yarn is (sock versus bulky, for example). So, as asked, this isn't really an answerable question--there is too much unknown about your yarn to answer with any certainty. My best suggestion would be to go to the yarn manufacturers website and look there for your answer. Or, go back to where you purchased the yarn, and ask there.