Question 1

What is fabric weight GSM?

Accepted Answer

GSM = grams per square meter. Light fabric: 100-150 GSM. Medium: 150-350 GSM. Heavy: 350+ GSM. Higher = thicker/heavier.

Question 2

What fabric weight is good for t-shirts?

Accepted Answer

Light tees: 120-150 GSM. Standard: 150-180 GSM. Premium: 180-200+ GSM. Heavier is more durable and opaque.

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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