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Learn the definitions and formulas of density, specific weight and specific gravity, and how to calculate them for different substances and gases. Find tables of values and examples of common materials and applications.
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- Universal Gravitational Law
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- Volume
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- Porosity
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Specific weight is the weight per unit volume of a material, which depends on density and gravity. Learn how to use specific weight in fluid mechanics, soil mechanics, civil engineering and mechanical engineering, and see tables of specific weight of water and air at different temperatures.
Specific weight is the weight of a substance per unit volume, which depends on its density and the gravitational field. Learn how to calculate specific weight, what factors affect it, and how it is used in various fields of science and engineering.
Learn the definitions and formulas of these properties of substances and how they relate to mass, volume, and acceleration of gravity. Find examples, units, and applications of specific weight and specific gravity.
- Table of Contents
- Definition
- Formula
- Unit of Measurement
- Example on How to Calculate Specific Weight
- Specific Weight of Water
- Specific Weight of Air
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Specific weight is defined as the ratio between weight and volume. Specific weight can also be defined as the product between density and gravitational acceleration. Specific weight, unlike density, is not absolute, it depends on the value of the gravitational acceleration (g), which varies depending on altitude and latitude. Go back
where: G [N] – weight V [m3] – volume m [kg] – mass g [m/s2] – gravitational acceleration The density ρ [kg/m3] is the ratio between mass (m) and volume (V): Replacing the expression of the density (2) in the formula of specific weight (1), we get: Go back
The symbol used for specific weight is the Greek letter γ (gamma). The SI unit of measurement for specific weight is [N/m3]. The unit of measurement for specific weight can easily be demonstrated from equation (3). The unit of measurement for density is [kg/m3]. The unit of measurement for gravitational acceleration is [m/s2]. Multiplying them as p...
Example 1. The density of water at 10 °C is 999.75 kg/m3. Knowing that gravitational acceleration is 9.81 m/s2, calculate the specific weight of waterat 10 °C. Applying the formula of specific weight (3), we get: Example 2. The density of air at 20 °C is 1.2041 kg/m3. Knowing that gravitational acceleration is 9.81 m/s2, calculate the specific weig...
Since water density varies with temperature, the specific weight of waterwill be function of temperature. Source: U.S. Department of the Interior, Bureau of Reclamation, 1977, Ground Water Manual, from The Water Encyclopedia, Third Edition, Hydrologic Data and Internet Resources, Edited by Pedro Fierro, Jr. and Evan K. Nyler, 2007. Go back
Since air density varies with temperature, the specific weight of airwill be function of temperature. Source: Wikipedia. Go back
Learn what specific weight is, how to calculate it and how it differs from density. Find the specific weight of water, air and mercury at different temperatures and the specific weight calculator.
Learn how to calculate and measure the density and specific gravity of substances using mass, volume, and water as a reference. Find examples, tables, and applications of density and specific gravity in chemistry and medicine.
Jun 14, 2024 · The specific weight, also known as the unit weight, is the weight per unit volume of a material. A commonly used value is the specific weight of water on Earth at 4 °C (39 °F), which is 9.807 kilonewtons per cubic metre or 62.43 pounds-force per cubic foot. Table of Contents. What is specific weight used for?
