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The surface-area-to-volume ratio (SA:V) is the ratio between surface area and volume of an object or collection of objects. It is used to explain the relation between structure and function in processes occurring through the surface and the volume, such as diffusion, heat transfer, and biology.
This web page provides a comprehensive list of units of measurement that are no longer used or are unusual, organized by type. It includes units of area, length, luminosity, mass, temperature, volume, and weight from various regions and periods.
Density is the mass per unit volume of a substance, and it varies with temperature and pressure. Learn about the SI and other units of density, the history of its discovery and calculation, and the density of common substances.
Volume is a measure of regions in three-dimensional space, often quantified using SI or imperial units. Learn about the history of volume calculation, the standardization of units, and the formulas for common shapes.
Energy density is the amount of energy stored in a given system or region of space per unit volume. Learn about different types of energy density, such as nuclear, chemical, electrical, and pressure, and see how they are measured and used in various contexts.
A liquid is a nearly incompressible fluid that conforms to the shape of its container but retains a nearly constant volume independent of pressure. Learn about the characteristics, types and applications of liquids, such as water, mercury, oil, and liquid crystals.
A metric prefix is a unit prefix that indicates a multiple or submultiple of a basic unit. The prefix giga (G) means 10^9 and is used for large units such as gigabyte or gigawatt.
A comprehensive list of definitions of terms and concepts relevant to physics and related fields, organized alphabetically. Learn the meanings and applications of words such as absolute zero, adiabatic process, alpha decay, and more.