Question 1

What is an arroba?

Accepted Answer

An arroba is a Spanish/Portuguese unit of about 11.5-15 kg depending on region. Still used for coffee, wine, and livestock in some areas.

Question 2

How much coffee is an arroba?

Accepted Answer

Brazilian coffee arroba = 15 kg. Colombian = 12.5 kg. Prices are often quoted per arroba in South American markets.

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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