Question 1

What is the apothecary weight system?

Accepted Answer

Historical pharmacy system: 20 grains = 1 scruple, 3 scruples = 1 dram, 8 drams = 1 apothecary ounce. Replaced by metric.

Question 2

Is apothecary weight still used?

Accepted Answer

Rarely. Modern pharmacy uses metric (grams, milligrams). Apothecary persists only in some traditional formulations.

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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