Hypodermic<unk> s are available in a wide variety of outer diameters described by<unk>  numbers. Smaller<unk>  numbers indicate larger outer diameters.  Inner diameter depends on both<unk>  and wall thickness. The following<unk>  shows nominal inner diameter and wall thickness for regular-wall<unk> s. Thin-wall<unk> s (not shown) have identical outer diameters but larger inner diameters for a given<unk> .
Needle gauge comparison chart
Pressure volume diagram
Kick chart
ABCD rating
Revised Trauma Score
French catheter scale
Peak flow meter
Electromagnetic spectrum