6cm is 60mm
In fluorescent tubes the number represents the diameter of the tube. The tubes are measures in 1/8ths of an inch. T8 would be 8/8ths or 1 inch. T5 would be 5/8ths of an inch. Older fixtures took T12 which would be 12/8ths or 1.5 inches.
Fluorescent tubes are measured in 1/8ths of an inch. A T8 would be 8/8ths or one inch. Likewise a T12 would be 12/8ths or one and a half inches.
There re 272 of them.
3/8ths
7 8ths = 7/8
fraction 3 8ths of 16 = 63/8 * 16 = 48/8 = 6
the fraction for 5/8ths is .63
0.625
0.625
1/4
The equivalent fraction of 2/8 is 1/4
43/8
3/4
27/8
One fourth 1/4
2/4 two fourths