Wikipedia has several categories that are named after physical quantities, which help organize articles based on various aspects of physics. Categories often include: 1. **Length** - Articles related to distance measurements and units of length. 2. **Mass** - Information about mass and related concepts, as well as units like kilograms. 3. **Time** - Topics related to time measurement, time intervals, etc. 4. **Temperature** - Articles concerning temperature measurement and scales.
Airspeed refers to the speed of an aircraft relative to the surrounding air. It is a critical parameter in aviation, as it affects performance, control, and safety. Airspeed can be measured in various ways, with the most common types being: 1. **Indicated Airspeed (IAS)**: This is the speed shown on the aircraft's airspeed indicator, uncorrected for variations in air density or instrument errors.
Dark energy is a mysterious form of energy that is thought to permeate all of space and is responsible for the accelerated expansion of the universe. It was first identified in the late 1990s when observations of distant supernovae showed that the universe was not only expanding but that its expansion was also accelerating.
Frequency, in a general sense, refers to the number of occurrences of a repeating event per unit of time. It is commonly used in various fields, including physics, music, and electronics. Here are a few specific contexts where the term "frequency" is relevant: 1. **Physics**: In wave mechanics, frequency is the number of cycles of a wave that pass a given point in one second.
Height typically refers to the measurement of an object or individual from base to top, or the distance from the ground to the highest point. In a biological context, height often pertains to humans or animals and is measured from the feet to the top of the head when standing upright. Height can be expressed in various units, such as centimeters, meters, feet, or inches. In other contexts, such as geography, height might refer to the elevation of a location above sea level or another reference point.
Precession refers to the gradual change or movement in the orientation of an astronomical body's rotational axis or orbital path. It occurs in various contexts in astronomy and physics, but one of the most commonly discussed forms is axial precession. ### Axial Precession (Precession of the Equinoxes) This is the phenomenon where the rotation axis of a planet (like Earth) wobbles over time.
Viscosity is a measure of a fluid's resistance to flow. It quantifies how thick or sticky a liquid is and is an important property in various fields, including physics, engineering, and fluid dynamics. There are two main types of viscosity: 1. **Dynamic Viscosity (Absolute Viscosity)**: This measures the internal resistance of a fluid to gradual deformation by shear stress or tensile stress.
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