Question 1

How many grams in an ounce?

Accepted Answer

1 oz = 28.35 grams (avoirdupois). 1 troy oz = 31.1 grams (precious metals). Know which system you need.

Question 2

How do I convert grams to ounces quickly?

Accepted Answer

Divide by 28 for approximate ounces. 100g ≈ 3.5 oz. 250g ≈ 8.8 oz. 500g ≈ 17.6 oz.

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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