What Is Unit Weight?
The ratio of the weight of a material to its volume is its unit weight, sometimes termed specific weight or weight density. The unit weight of water, γw, is 9.81 kN/m^{3} in the SI system and 62.4 lb/ft^{3} in the English system.
What Is Density?
The term density is used herein to denote the masstovolume ratio of the material. However, some references, particularly older ones, use the term to describe unit weight. Density is denoted by p. Because m = W/g, the unit weight terms defined above can be converted to mass densities as follows:
ρ = M/V
ρ = Density
M = Mass
V = Volume
In the SI system mass densities are commonly expressed in Mg/m^{3}, kg/m^{3}, or g/ml. The mass density of water can therefore be expressed ρw = 1000 kg/m^{3} = 1 Mg/m^{3} = 1 g/ml.
The mass density of soil solids typically ranges from 2640 to 2750 kg/m^{3}. Where mass or mass density values (g, kg, or kg/m^{3}) are given or measured, they must be multiplied by g(9.8 m/s^{2}) to obtain weights or unit weights before performing stress calculations.
In the English system mass density values are virtually never used in geotechnical engineering and all work is performed in terms of unit weights (1b/ft^{3}).
What Is Unit Weight Material?
Unit weight material is also known as Specific material weight. Unit weight material is the weight of the material per unit volume. As we know that the volume is identified in terms of liters or m^{3} and weight is measured in terms of Kg or KN.
The unit weight of materials is the weight of material/unit volume which means the Unit weight is expressed in Kg/L or KG/m^{3} or KN/m^{3}. For easy reference, we organized all the building materials unit weights in a table. This list is a collective effort. Give a thumbs up if you liked it. Bookmark the page and use the search if required.
Unit Weight Building Materials
Sr.No.

Material

Unit Weight

1  A.C Sheet  17 Kg/m^{3} 
2  Aerocon Bricks  551 to 600 Kg/m^{3} 
3  Alcohol  780 Kg/m^{3} 
4  Aluminum  2739 Kg/m^{3} 
5  Anthracite Coal  1550 Kg/m^{3} 
6  Ashes  650 Kg/m^{3} 
7  Ballast  1720 Kg/m^{3} 
8  Birch Wood  670 Kg/m^{3} 
9  Bitumen  1040 Kg/m^{3} 
10  Bituminous concrete  2243 Kg/m^{3} 
11  Bituminous Macadum  2400 Kg/m^{3} 
12  Brick  1600 – 1920 Kg/m^{3} 
13  Brick Jelly  1420 Kg/m^{3} 
14  Brick Masonry  1920 Kg/m^{3} 
15  Cast iron  7203 Kg/m^{3} 
16  Ceement Slurry  1442 Kg/m^{3} 
17  Cement Concrete block  1800 Kg/m^{3} 
18  Cement Grout  1500 to 1800 Kg/m^{3} 
19  Cement Mortar  2000 Kg/m^{3} 
20  Cement Plaster  2000 Kg/m^{3} 
21  Cemrent  1400 Kg/m^{3} 
22  Chalk  2220 Kg/m^{3} 
23  Clay (Damp)  1760 Kg/m^{3} 
24  Clay (dry)  1600 Kg/m^{3} 
25  Clinker  750 Kg/m^{3} 
26  Coal Tar  1200 Kg/m^{3} 
27  Coarse Aggregate  16801750 Kg/m^{3} 
28  Cobalt  8746 Kg/m^{3} 
29  Copper  8940 Kg/m^{3} 
30  Crude Oil  880 Kg/m^{3} 
31  Cuddapa  2720 Kg/m^{3} 
32  Disel  745 Kg/m^{3} 
33  Dry Rubble Masonry  2080 Kg/m^{3} 
34  Earth (Dry,loose)  1200 Kg/m^{3} 
35  Fly Ash  1120 to 1500 Kg/m^{3} 
36  Fly Ash Brick Masonry  2000 to 2100 Kg/m^{3} 
37  Fly Ash Bricks  1468 to 1700 Kg/m^{3} 
38  Galvanized Iron Steel (0.56 mm)  5 Kg/m^{3} 
39  Galvanized Iron Steel (1.63 mm)  13 Kg/m^{3} 
40  Gasoline  670 Kg/m^{3} 
41  GeoPolimer Concrete  2400 Kg/m^{3} 
42  Glass Reinforced Concrete  2000 to 2100 Kg/m^{3} 
43  Granite Stone  24602800 Kg/m^{3} 
44  Graphite  1200 Kg/m^{3} 
45  Gravel Soil  2000 Kg/m^{3} 
46  Green Concrete  2315 to 2499 Kg/m^{3} 
47  Heavy Charcoal  530 Kg/m^{3} 
48  Ice  910 Kg/m^{3} 
49  Igneous rocks (Felsic)  2700 Kg/m^{3} 
50  Igneous rocks (Mafic)  3000 Kg/m^{3} 
51  Kerosene  800 Kg/m^{3} 
52  Larch Wood  590 Kg/m^{3} 
53  Laterite Stone  1019 g/m^{3} 
54  Lead  11340 Kg/m^{3} 
55  Light Charcoal  300 Kg/m^{3} 
56  Light Weight Concrete  800 to 1000 Kg/m^{3} 
57  Lime Concrete  1900 Kg/m^{3} 
58  Lime Plaster  1700 Kg/m^{3} 
59  Lime Stone  2400 – 2720 Kg/m^{3} 
60  M Sand  1540 Kg/m^{3} 
61  Magnesium  1738 Kg/m^{3} 
62  Mahogany  545 Kg/m^{3} 
63  Mangalore Tiles with Battens  65 Kg/m^{3} 
64  Maple  755 Kg/m^{3} 
65  Marble Stone  2620 Kg/m^{3} 
66  Metamorphic rocks  2700 Kg/m^{3} 
67  Mud  16001920 Kg/m^{3} 
68  Nickel  8908 Kg/m^{3} 
69  Nitric Acid (91 percent)  1510 Kg/m^{3} 
70  Oak  730 Kg/m^{3} 
71  Peat  750 Kg/m^{3} 
72  Petrol  720 Kg/m^{3} 
73  Pitch  1100 Kg/m^{3} 
74  Plain Cement Concrete  2300 Kg/m^{3} 
75  Plaster of Paris  881 Kg/m^{3} 
76  Plastics  1250 Kg/m^{3} 
77  Quarry Dust  1300 to 1450 Kg/m^{3} 
78  Quartz  2320 Kg/m^{3} 
79  Quick lime  33450 Kg/m^{3} 
80  Rapid Hardening Cement  1250 Kg/m^{3} 
81  Red Wood  450510 Kg/m^{3} 
82  Reinforced Cement Concrete  2400 Kg/m^{3} 
83  Rubber  1300 Kg/m^{3} 
84  Rubble stone  16001750 Kg/m^{3} 
85  Sal Wood  990 Kg/m^{3} 
86  Sand  14401700 Kg/m^{3} 
87  Sandstone  2250 to 2400 Kg/m^{3} 
88  Sedimentary rocks  2600 Kg/m^{3} 
89  Shale Gas  2500 Kg/m^{3} 
90  Silt  2100 Kg/m^{3} 
91  Slag  1500 Kg/m^{3} 
92  Stainless Steel  7480 Kg/m^{3} 
93  Steel  7850 Kg/m^{3} 
94  Sulphuric Acid (87 Percent)  1790 Kg/m^{3} 
95  Teak  630720 Kg/m^{3} 
96  Tin  7280 Kg/m^{3} 
97  Water  1000 Kg/m^{3} 
98  Zinc  7135 Kg/m^{3} 
FAQ
What Is Unit Weight?
Unit weight, also known as specific weight or weight density, is the ratio of the weight of a material to its volume. In the SI system, the unit weight of water is 9.81 kN/m³, and in the English system, it’s 62.4 lb/ft³.
How Is Density Different from Unit Weight?
Density refers to the masstovolume ratio of a material, denoted by ρ. It is calculated as ρ = M/V, where M is mass and V is volume. Unit weight, on the other hand, is the weight per unit volume and is used primarily in geotechnical engineering.
How Do You Convert Unit Weight to Density?
To convert unit weight to density, use the formula ρ = γ/g, where γ is the unit weight and g is the acceleration due to gravity (approximately 9.8 m/s²). For example, a unit weight of 10 kN/m³ converts to a density of 10,000 kg/m³.
What Are Common Units for Expressing Density?
Density is commonly expressed in units such as kg/m³, g/cm³, or Mg/m³ in the SI system, and lb/ft³ or lb/in³ in the English system.
What Are Typical Unit Weights for Building Materials?
The unit weight of building materials varies widely. For example, cement concrete has a unit weight of about 2400 kg/m³, while lightweight concrete can range from 800 to 1000 kg/m³.
Why Is It Important to Know the Unit Weight of Materials?
Knowing the unit weight of materials is crucial for various engineering calculations, including loadbearing capacity, structural design, and material handling. It helps ensure that structures are designed safely and efficiently.
How Does the Unit Weight of Soil Impact Construction?
The unit weight of soil affects its compaction, stability, and bearing capacity. Engineers use this information to assess soil properties and design foundations and other structural elements accordingly.
How Do Environmental Factors Affect Unit Weight and Density?
Environmental factors such as moisture content, temperature, and pressure can affect both unit weight and density. For example, the unit weight of soil can increase with moisture content due to the added weight of water.
What Is the Significance of Mass Density in Geotechnical Engineering?
In geotechnical engineering, mass density is used to understand soil and rock properties, which are critical for foundation design, slope stability, and other structural assessments.
Can Unit Weight and Density Values Vary for the Same Material?
Yes, unit weight and density values can vary for the same material depending on factors such as compaction, moisture content, and impurities. For instance, the unit weight of soil can differ based on its compaction level.