Meter per second (m/s or m/sec)

The meter per second is the SI unit of speed. It expresses the distance traveled in a given time. One meter per second is equal to the speed of light in a vacuum. How do you write meters per second? The SI unit for velocity is the meter per second (m/s). To write meters per … Read more


A meter is a unit of measure used to quantify the amount of something, such as electrical current, length, or volume. The International System of Units (SI) defines the meter as the distance traveled by light in a vacuum in 1/299,792,458 of a second. In other words, the meter is the distance light travels in … Read more

GIF (Graphics Interchange Format)

The Graphics Interchange Format (GIF) is a bitmap image format that was developed by US-based software company CompuServe in 1987. It has since been adopted by many other internet platforms and is one of the most widely used image formats on the web. GIF images are typically compressed using the Lempel-Ziv-Welch (LZW) algorithm, which is … Read more

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