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Rev. Notes > AS > Physical quantities and units
Previous Topic Physical quantities and units Next Topic



Areas of Physics

Interdisciplanary areas of physics

Quantities in Physics

Base Units

Convention for indicating units

Derived Units

S.I. Units (International System of Units)

Supplementary units

Homogeneity of equations

Significant figures

Rules of Significant figures

Further discussion on Significant figures


Scientific notation

The Avogadro's Constant

Scalars and Vectors

Addition and subtraction of co-planar vectors

Rectangular components of a vector


Supplementary units

The General Conference on Weights and Measures has no yet classified certain units of the SI under either base units or derived units., These SI units are called supplementary units. For the time being this class contains only two units of purely geometrical quantities, which are plane angle and the solid angle.

The radian is the plane angle between two radii of a circle which cut off on the circumference an arc, equal in length to the radius.

(one radian is just under 57.3 degrees) 

The Steradian is the solid angle (three dimensional angle) subtended at the centre of a sphere by an area of its surface equal to the square of radius of the sphere.

(There are 4 pi, or approximately 12.5664,steradians in a complete sphere)

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View Comments on this Chapter - Total Comments (4)
Student Said :

Super i got so much of information through

  11/07/15 09:09 AM
Kennyworthy Mphande Said :
nicely explained.
  26/01/15 07:00 PM
benard wilson Said :
very good notes and easy to understand. i wish u can make more of dem
  10/09/14 09:57 PM
muhammad fawad Said :
nice writting..
  06/05/14 06:47 PM


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