Units of mass

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Mesopotamian weights made of hematite.

The mass is a physical magnitude that measures the amount of matter contained in a body. In the International System of Units, the official unit of mass is the kilogram. In the cgs system it is the gram.

Units of the International System of Units (SI)

Main article: International Unit System

Teragram 10¹² g (Tg)
Gigagram 10⁹ (Gg)
Megagram or Metric Ton 10⁶ (Mg or t)
Fifth metric 10⁵ (q)
Kilogram 103 g (kg)
Hectogram 102 g (hg)
Decagram 10¹ g (dag)
gram, 1 g (g)
decigram, 10⁻¹ (dg)
centigram, 10⁻² g (cg)
milligram, 10⁻³ (mg)
microgram, 10⁻⁶ g (μg)
nanogram, 10⁻⁹ g (ng)
picogram, 10⁻¹² g (pg)
femtogram, 10⁻¹⁵ g (fg)
attogram, 10⁻¹⁸ g (ag)
zeptogram, 10⁻²¹ g (zg)
Yoctogram, 10⁻²⁴ (yg)

English system of measurements

In the English system of measurements, the standard unit of mass is the pound.

United Kingdom

Long ton or British
Long or British Room
Long or British
Stone
Libra avoirdupois
Onza avoirdupois
Dracma avoirdupois
Grano

In the United States

Short or American ton
Short or American Room
Short or American
Arroba
Libra avoirdupois
Onza avoirdupois
Dracma avoirdupois
Grano

Equivalents in the United States

	Rooms	Quintales	Arrobas	Libras	Onions	Dracmas	Grains
American ton	4	20	80	2,000	32,000	512,000	14,000.000
American Room	-	5	20	500	8,000	128,000	3,500,000
American Fifth	-	-	4	100	1.600	25.600	700,000
Arroba	-	-	-	25	400	6.400	175,000
Libra avoirdupois	-	-	-	-	16	256	7,000
Onza avoirdupois	-	-	-	-	-	16	437.5
Dracma avoirdupois	-	-	-	-	-	-	27,34375

Jewelry units

carat (troy): 4 grams metric
Metric grain: 50 mg

Units of Jewelery (Anglo-Saxon)

	Onzas troy	Dracmas troy	Pennyweight	Grains
Libra troy	12	96	240	5.760
Onza troy	-	8	20	480
Dracma troy	-	-	2.5	60
Pennyweight	-	-	-	24

Carat (orfebred) = 4.167 % of precious metal purity.

Gravitational measurement systems

Technical

UTM (technical mass unit)

English

Slug

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