Glossary Archive

Ultraviolet (UV) light is a type of electromagnetic radiation with wavelengths ranging from 10 to 400 nanometers, shorter than visible light but longer than X-rays[1]. It constitutes about 10% of the total electromagnetic radiation output from the Sun and is also produced by various artificial sources[1]. Key characteristics of UV radiation: Wavelength range: 10-400 nanometers...

Unisex fashion, also known as gender-neutral or gender-inclusive fashion, is a trend that challenges traditional gender norms by creating clothing and styles that can be worn by individuals regardless of their gender identity. This movement aims to break down the barriers and stereotypes associated with clothing, allowing people to express themselves freely without conforming to...

The United States of America, commonly known as the United States (U.S. or USA), is a country primarily located in North America. It is a federal republic of 50 states, a federal capital district (Washington, D.C.), and several territories. The U.S. accounts for about 25% of the global economy and 30% of global wealth, with...

A V-twin engine is a type of two-cylinder piston engine where the cylinders are arranged in a "V" shape around the crankshaft. This configuration is commonly used in motorcycles, offering various advantages such as compact size, good primary and secondary balance, and a pleasing firing order. V-twins can have different Vee-angles, with a 90° angle...

Velcro, a revolutionary fastening system, traces its origins back to the innovative mind of Swiss electrical engineer George de Mestral in the 1950s. Inspired by the burdock burrs that stuck to his dog's fur during a hike in 1941, de Mestral embarked on a journey of discovery that led to the creation of hook-and-loop fasteners....

Passive ventilationPassive ventilation is the process of supplying air to and removing air from an indoor space without using mechanical systems. It refers to the flow of external air to an indoor space as a result of pressure differences arising from natural phenomena. There are two types of natural ventilation occurring in buildings: wind-driven ventilation...

Vibration Definition and overview of vibration as a mechanical phenomenon, including deterministic and random vibrations, desirable and undesirable vibrations, natural frequencies, and related concepts in mechanical engineering. Vibrations (disambiguation) Disambiguation page for "Vibrations," which may refer to mechanical oscillations or other topics. Category: Mechanical vibrations A category page listing articles related to mechanical vibrations, including...

Viscoelasticity is a fundamental property of materials that combines both viscous and elastic characteristics, offering a unique blend of behaviors when subjected to stress or strain. This quality is observed in a wide range of materials, from natural biological structures like tissues and cartilage to synthetic polymers and concrete. Understanding viscoelasticity involves grasping the interplay...

The visible spectrum is the portion of the electromagnetic spectrum that can be detected by the human eye[1]. It consists of wavelengths ranging from approximately 380 to 750 nanometers, corresponding to frequencies between 400 and 790 terahertz[1]. This range of light is what we perceive as colors, from violet at the shortest wavelengths to red...

The void ratio, a fundamental concept in materials science and geotechnical engineering, is defined as the ratio of the volume of voids to the volume of solids in a mixture or composite. It is a dimensionless quantity closely related to porosity, which plays a crucial role in various fields such as composites, mining (especially tailings...

Ultraviolet (UV) light is a type of electromagnetic radiation with wavelengths ranging from 10 to 400 nanometers, shorter than visible light but longer than X-rays[1]. It constitutes about 10% of the total electromagnetic radiation output from the Sun and is also produced by various artificial sources[1]. Key characteristics of UV radiation: Wavelength range: 10-400 nanometers...

Unisex fashion, also known as gender-neutral or gender-inclusive fashion, is a trend that challenges traditional gender norms by creating clothing and styles that can be worn by individuals regardless of their gender identity. This movement aims to break down the barriers and stereotypes associated with clothing, allowing people to express themselves freely without conforming to...

The United States of America, commonly known as the United States (U.S. or USA), is a country primarily located in North America. It is a federal republic of 50 states, a federal capital district (Washington, D.C.), and several territories. The U.S. accounts for about 25% of the global economy and 30% of global wealth, with...

A V-twin engine is a type of two-cylinder piston engine where the cylinders are arranged in a "V" shape around the crankshaft. This configuration is commonly used in motorcycles, offering various advantages such as compact size, good primary and secondary balance, and a pleasing firing order. V-twins can have different Vee-angles, with a 90° angle...

Velcro, a revolutionary fastening system, traces its origins back to the innovative mind of Swiss electrical engineer George de Mestral in the 1950s. Inspired by the burdock burrs that stuck to his dog's fur during a hike in 1941, de Mestral embarked on a journey of discovery that led to the creation of hook-and-loop fasteners....

Passive ventilationPassive ventilation is the process of supplying air to and removing air from an indoor space without using mechanical systems. It refers to the flow of external air to an indoor space as a result of pressure differences arising from natural phenomena. There are two types of natural ventilation occurring in buildings: wind-driven ventilation...

Vibration Definition and overview of vibration as a mechanical phenomenon, including deterministic and random vibrations, desirable and undesirable vibrations, natural frequencies, and related concepts in mechanical engineering. Vibrations (disambiguation) Disambiguation page for "Vibrations," which may refer to mechanical oscillations or other topics. Category: Mechanical vibrations A category page listing articles related to mechanical vibrations, including...

Viscoelasticity is a fundamental property of materials that combines both viscous and elastic characteristics, offering a unique blend of behaviors when subjected to stress or strain. This quality is observed in a wide range of materials, from natural biological structures like tissues and cartilage to synthetic polymers and concrete. Understanding viscoelasticity involves grasping the interplay...

The visible spectrum is the portion of the electromagnetic spectrum that can be detected by the human eye[1]. It consists of wavelengths ranging from approximately 380 to 750 nanometers, corresponding to frequencies between 400 and 790 terahertz[1]. This range of light is what we perceive as colors, from violet at the shortest wavelengths to red...

The void ratio, a fundamental concept in materials science and geotechnical engineering, is defined as the ratio of the volume of voids to the volume of solids in a mixture or composite. It is a dimensionless quantity closely related to porosity, which plays a crucial role in various fields such as composites, mining (especially tailings...