Question 1

What weight units are most common?

Accepted Answer

Metric: grams, kilograms, tonnes. US: ounces, pounds, tons. UK: also uses stone for body weight. Context determines best unit.

Question 2

How do I choose the right weight unit?

Accepted Answer

Cooking: grams/ounces. Body weight: kg/lbs/stone. Shipping: kg/lbs. Precious metals: troy ounces. Match your audience.

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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