A 9mm pencil lead is thicker than a 7mm pencil lead.
A 5mm lead is darker than a 7mm lead because the larger the lead size, the lighter the mark it tends to produce on paper.
The "number 2" designation refers to the "hardness" of the lead. The higher the number, the "harder" The "7mm" designation refers to the "thickness" of the lead. The higher the number, the thicker. They are not the same pencil.
.5mm is finer than .7 mm
Yes, by 2 mm (.07in).
It is 7 mm - 2 mm = 5 mm.
The standard thickness of a pencil is 7mm. However, pencils can vary in thickness depending on the manufacturer and type of pencil.
For UK diving you may still want to vary the thickness of your gear, depending on the water temperature, but for footwear, thicker is better than thinner as it will get a rougher time than most of your suit. I would say 3mm at least.
7mm is thicker than 1mm
Yes. Its small obviously, but at just over half a centimetre, it is definitely a line!! =D Yes. Do you want a line 7mm in lenght or a line that is 7mm wide (many writing pens draw lines that are 5mm & 7mm wide).
Depend on the temperature of the water. >80F none 65-79F use 5mm <65 use 7mm
A bathing suit for starters, a rash guard, or most surfers wear nothing under. A common additional item to wear under a wetsuit is a one piece lycra suit. The benefits of this are that it makes the wetsuit easier to put on and off, and the lycra doesn't compress. For instance someone diving a 5mm farmer john (2 piece) wetsuit and a 2mm lycra dives deep enough that the wetsuit has compressed to half its original thickness. This diver now has 2.5mm of wetsuit covering their legs and arms, 5mm covering their core (chest, stomach.) Now when you add the 2mm from the lycra which hasn't compressed there is actually 4.5mm on the legs/arm and 7mm over the core area. A diver in a 7mm farmer john at the same depth is left with 3.5mm on the legs/arms and 7mm over the core. If you double the depth at this point the 5mm and the lycra gain a lead over the thicker wetsuit. The free aditional benefit to this item is that you may be able to get rid of some extra weight as you can use a thinner wetsuit which will require less weight to get you under.