Question 1

What are the main metric weight units?

Accepted Answer

Microgram (μg), milligram (mg), gram (g), kilogram (kg), tonne (1000 kg). Each step is 1000×.

Question 2

What are the main imperial weight units?

Accepted Answer

Grain, ounce (16 drams), pound (16 oz), stone (14 lbs), hundredweight, ton (2000 or 2240 lbs).

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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