Science Park main page

Science Park

science park

Table of Elements

Chemical information

Science dictionary

scientific data

Site map

Gifts and souvenirs


printable version

Units

Fundamental SI

Supplementary SI

Other SI

SI Prefixes



Education Billboard - meet and serve your education needs

chemistry calculations



moon phases
 

fundamental SI Supplementary SI units other SI

There are two supplementary SI units that are used to distinguish between quantities which are of a different nature. Otherwise, they would have the same SI units. For example, angular velocity is specified in units of radians per second (rads-1). Since radian is dimensionless, without the supplementary unit the angular velocity would have specified as s-1, which is the same as that of frequency. The supplementary units are shown below:

Supplementary quantity

Name

Symbol

plane angle

radian

rad

solid angle

steradian

sr

Definition

  • Radian - It is the plane angle between two radii of a circle that cut off on the circumference an arc equal in length to the radius.

  • Steradian - It is the solid angle that, having its vertex in the center of a sphere, cuts off an area of the surface of the sphere equal to that of a square with sides of length equal to the radius of the sphere.

fundamental SI other SI


| Copyright | Privacy | Disclaimer | Contact |

2004-2010 Etacude.com, all rights reserved.