Moon’s mean radius

The Moon’s mean radius is the average distance from the center of the Moon to its surface. It is 3,476 kilometers, or 2,159 miles. What is the Moon’s radius in miles? The Moon’s radius is 1,737.1 kilometers, or 1,080.7 miles. What is the radius and mass of the Moon? According to the National Aeronautics and … Read more

Kilowatt-hour (kWh)

A kilowatt-hour, or kWh, is a unit of energy that is equal to 1,000 watts of power used over the course of one hour. This is the standard unit of measurement for energy consumption in many countries around the world, and is often used by utility companies to billing customers for their electricity usage. What … Read more

Working draft (draft document)

A working draft (WD) is a document produced by an organization or group that is working on a project. It is a draft document that is not yet complete, but it is available for review and comment. How do you write a draft document? A draft document is typically created in order to capture the … Read more

Certified Internet Webmaster (CIW)

A Certified Internet Webmaster (CIW) is a professional who has demonstrated the knowledge and skills necessary to build, maintain and manage web sites. CIW certification is administered by the CIW Consortium, a non-profit organization that promotes the development and adoption of standards for the web. Does CIW certification expire? CIW certification does not expire, but … Read more

Wien’s constant

Wien’s constant is the value of the constant in Wien’s displacement law, which states that the wavelength λ of the peak of the black-body radiation curve is inversely proportional to the temperature T of the black body: λ_{max} = frac{b}{T} where b is Wien’s constant, equal to 2.8977729(17)×10−3 m·K. The law is named after Wilhelm … Read more


In computer science, a liquid is a data structure that can be resized without having to re-allocate or copy its contents. A liquid is similar to an array, except that the size of a liquid can be changed dynamically. This makes liquids well-suited for applications where the amount of data is not known in advance, … Read more

Cubic meter (meter cubed)

A cubic meter is a unit of measurement for volume. The cubic meter is the SI unit of volume and is equal to the volume of a cube with sides that are one meter in length. How many m3 are in a cube? A cube is a three-dimensional shape with six faces, all of which … Read more

Square meter (meter squared)

The square meter, or meter squared, is the SI unit of area. It is defined as the area of a square with sides of one meter. The square meter is used extensively in construction and real estate, as it is the standard unit of area for measuring land. In the metric system of measurement, the … Read more

Planck’s constant

Planck’s constant is a physical constant that is used to describe the behavior of subatomic particles. It is named after German physicist Max Planck, who first proposed it in 1900. Planck’s constant is important in many areas of physics, including quantum mechanics and quantum field theory. It is also used in the study of black … Read more

Boltzmann’s constant

Boltzmann’s constant is a physical constant that is used to relate the average kinetic energy of particles to the temperature of a system. The value of Boltzmann’s constant is approximately equal to 1.38064852 x 10^-23 joules per Kelvin. What is Boltzmann constant unit? Boltzmann constant is the unit of measurement for entropy in the International … Read more