The French scale or French gauge system is commonly used to measure the size of a catheter. It is most often abbreviated as Fr, but can often be seen abbreviated as Fg, Ga, FR or F. It may also be abbreviated as CH or Ch (for Charriere, charriÃ¨re its). Inventor The french = size 3 times the diameter in. millimeters round catheter of 1 French has an external diameter of 1â3 mm, and therefore the diameter of a round catheter in millimetres can be determined by dividing the French size by 3: D (mm) = Fr / 3. or. Fr = D (mm) * 3. For example, if the French size is 9, the diameter is 3 mm.
The violin has the highest pitch range of all the string instruments. 5 people found this useful.
So the octave below in frequency would be the 3rd and the octave above in frequency would be the 5th. Each note in an octave is twice the pitch or frequency of the same note in the octave below. For example, an A in the 4th octave, called A4, is 440Hz and an A in the 5th octave, called A5 is 880Hz. Duration of a Musical Note.