Question 1

What is yarn weight?

Accepted Answer

Yarn is categorized by thickness: lace (0), fingering (1), sport (2), DK (3), worsted (4), bulky (5), super bulky (6). Higher = thicker.

Question 2

What is WPI in yarn?

Accepted Answer

Wraps Per Inch - how many times yarn wraps around a ruler in 1 inch. More WPI = finer yarn. Worsted = 9-12 WPI.

Question 3

Is there a difference between mass and weight?

Accepted Answer

Yes! Mass (kg) is amount of matter, constant everywhere. Weight (newtons or pounds-force) is gravitational force on mass, varies by location.

Question 4

Why do jewelry and precious metals use different units?

Accepted Answer

Troy system (troy ounces, pennyweights) has been used for precious metals since the Middle Ages. 1 troy oz = 31.1g vs 1 regular oz = 28.35g.

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