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SciShow
Why's a Meter a Meter?
Meter is the standard unit of length used by most countries around the world. But how did they define it?
Curated Video
Velocity
A video entitled “Velocity” which defines the term velocity and shows how velocity is measured by examining the equation used to solve for its value.
BioEd Online
Bio Ed Online: Describing Solutions
Most scientists use a common language of measurement, called the International System of Units, that is recognized in labs all over the world. In thie following video David Caprette, PhD, explains this language and its well-established...
Study Pug
Study Pug: Metric Systems
In this tutorial, you will see how to convert cm to m (centimeter to meter) and m to km (meter to kilometer). Thorough descriptions and examples are provided. Also includes a video lesson and practice problems. [2:06]
Crash Course
Crash Course Chemistry #2: Unit Conversion & Significant Figures
A unit is the frequently arbitrary designation we have given to something to convey a definite magnitude of a physical quantity and every quantity can be expressed in terms of the seven base units that are contained in the international...