A light-second is a unit of distance that measures how far light travels in one second in a vacuum. Since the speed of light is approximately \(299,792,458\) meters per second, a light-second is equivalent to about \(299,792,458\) meters, or approximately \(300,000\) kilometers (or about \(186,282\) miles).

"Pous" can refer to a few different things depending on the context: 1. **Pous, the Bird**: In the context of ornithology, "pous" is sometimes used to refer to certain types of birds, particularly in specific regional dialects.

The rayleigh (symbol: R or ray) is a unit of measurement used in optics and physics to quantify the intensity of light, specifically for the measurement of the brightness of astronomical objects or the scattering of light. 1 rayleigh is defined as the amount of light scattered by a molecule of gas that results in a change of intensity of 1 photon per square meter per second.

"Catty" can refer to a few different things depending on the context: 1. **Adjective**: In casual usage, "catty" describes a person (usually a woman) who is spiteful, malicious, or inclined to gossip. It implies a tendency to speak ill or criticize others in a sneaky or underhanded way.

Kendrick mass, also known as "Kendrick mass number," is a term used in astrodynamics, particularly in the context of space missions. It refers to the mass of a spacecraft as it is expressed in terms of Earth's gravitational influence, taking into account the spacecraft's velocity and its position in a gravitational field.

A Solar Flux Unit (SFU) is a measure of solar radio flux, specifically at a frequency of 2800 MHz (or 2.8 GHz). It is commonly used in solar and astrophysical research to quantify the intensity of solar radiation, particularly from the Sun's active regions such as sunspots and solar flares. 1 SFU is defined as a flux density of \(10^{-22}\) watts per square meter per hertz (W/m²/Hz).

Wind chill, also known as wind chill factor, is a measure that describes the combined effect of wind and cold temperatures on the human body. It quantifies how cold it feels to a person when wind is taken into account, as moving air increases the rate at which heat is lost from the body. When temperatures drop, the body loses heat more quickly, and when wind is present, this heat loss is accelerated.

Surface Feet Per Minute (SFPM or SFM) is a measurement commonly used in manufacturing and machining to indicate the speed at which the surface of a rotating tool or workpiece moves. It's expressed in feet per minute and helps determine the speed at which a cutting tool should operate for optimal performance. In machining applications, SFM is critical because it impacts the quality of the cut, the tool wear, and the overall efficiency of the machining process.

East Asian units of measurement refer to traditional measurement systems used in various East Asian countries, including China, Japan, Korea, and Vietnam. These systems often have historical roots and differ significantly from the metric system. Here are some notable units from these countries: ### China 1. **Length** - **Chi (尺)**: A traditional unit often translated as "foot," approximately 1/3 of a meter.

Metre sea water (msw or mS) is a unit of measurement used to express the density of seawater, particularly in the context of oceanography. It is defined as the equivalent depth of seawater that exerts a specific pressure at a given depth. The term is often used when dealing with hydrostatic pressure calculations or when discussing the buoyancy and density of water in marine environments.

A millimetre of mercury (mmHg) is a unit of pressure. It is defined as the pressure exerted at the base of a millimetre column of mercury under the acceleration of gravity. The unit is commonly used in various scientific and medical contexts, particularly in measuring blood pressure and atmospheric pressure. 1 mmHg is approximately equal to 133.322 pascals (Pa) or 0.001316 atmospheres (atm).

Units of temporal rate refer to the measurement of a change or occurrence per unit of time. These units allow us to quantify how quickly something happens, how often an event occurs, or how much of something is produced or consumed over a specific timeframe. The exact units can vary significantly depending on the context. Here are some common examples: 1. **Frequency**: Measured in Hertz (Hz), which indicates the number of occurrences of a repeating event per second.

Sidereal time is a timekeeping system that is based on the position of the stars as observed from Earth. Unlike solar time, which is based on the position of the Sun in the sky (and which defines a day as the time it takes for the Earth to complete one rotation relative to the Sun), sidereal time measures the Earth's rotation relative to distant celestial objects, primarily stars. A sidereal day is approximately 23 hours, 56 minutes, and 4 seconds long.

A cord is a unit of measure used for quantifying firewood or timber. It is defined as the volume of a stack of wood that measures 128 cubic feet (3.62 cubic meters). Typically, a cord is stacked in a way that the pieces of wood are neatly arranged and not just loosely piled. The standard measurement for a cord is often visualized as a stack that is 4 feet high, 4 feet wide, and 8 feet long.

The "Friedman Unit" is a colloquial term used to describe a time measurement of six months in the context of U.S. military and political discussions, particularly those related to the Iraq War. The term is named after the New York Times columnist Thomas Friedman, who used it to illustrate the tendency of political and military leaders to predict that a significant turning point would occur in Iraq within six months, only to see those predictions repeatedly postponed.

Metres per hour (m/h) is a unit of speed that indicates how many metres are traveled in one hour. It is a straightforward measurement of velocity in the metric system. For example, if a car travels at a speed of 100 metres per hour, it means that if the car maintained that speed consistently for one hour, it would cover a distance of 100 metres.

The amphora is an ancient unit of measurement used primarily in the Mediterranean region, particularly by the Greeks and Romans. It refers to a container, typically made of clay, that was used for the storage and transport of various goods, especially liquids like wine and oil. The size of an amphora could vary, but it is generally understood to hold about 26 to 39 liters (approximately 6.9 to 10.3 gallons).

The "chopin" is a unit of measurement used in the field of music, specifically to quantify the thickness of sheet music or related materials. It is named after the composer Frédéric Chopin, who is known for his contributions to piano music and composition. However, it is not a widely recognized or standardized unit of measurement and is more of a colloquial term rather than an officially accepted unit like those found in science or engineering.

Close harmony and open harmony are terms used in music theory to describe the spacing and arrangement of chords, particularly in vocal arrangements and instrumentation. ### Close Harmony: - **Definition**: Close harmony refers to the arrangement of notes in a chord that are positioned closely together, often within an octave. In close harmony, the notes are typically placed in such a manner that the interval between the highest and lowest notes is relatively small.