To be exact; Half inch = 12.7 mm

Therefore, if you want to round it up, 1/2 inch is 12.5 mm,

*not* 13mm.

Therefore, your rounding was 0.5mm out -

**4%** ...a crucial factor in human life support applications ( like climbing, abseiling, caving, vertical rescue, etc ).

Please, read my previous post more carefully, again.

Knots are

*utilized* by humans ( like numbers do...), but knot tyers can also study them for their properties

*as knots*, independently of their

*applications* ( like mathematicians study

*numbers*, independently of their usefulness in counting apples...

) . You can design, built and use wheels to go to the next village and steal the other chief s wife, but you can also study the properties of the circle per se. And pi, you know, should not be rounded to 3...

Anyway, knots are NOT used only in "

*human life support applications*", by "climbers", etc ! To learn who needed most, and contributed most in the evolution of practical knots, read the very first sentence of ABoK !

The absolute strength of a knot is not "

*nonsense*" or "

*irrelevant*", because there is always the possibility of an unexpected, uncontrollable, excessive loading, which will test the properties of this-knot-assisted structures beyond the "safety factors" ( those structures may be just scaffolds made of ropes, knots and bamboo poles, used

*now*, as we speak, at construction sites in China and NorthEast Asia...).

You are a climber, and it comes natural for you to "see" the knots merely as means to your beloved end, so you are interested mainly in knots utilized for climbing, and mainly in the properties of those knots which are useful in climbing - the hammer and the nails ontological relation, you know...

Strength is not important - what is important is being able to retrieve your ropes.

In THIS particular application ! In other applications, the priority relation may differ, or even be the exact opposite.

The knot works.

*So what *?

Almost ALL knots, even the most

*dumb* ones ( like three-four overhand knots or half hitches, the one after the other, for example ) will "work", in most cases... Do not limit your view in what a knot can

**do**, "see" what a knot

**is** independently of the particular application - and even independently of

*any* application ! Knowledge has a "value", which may be transformed into a "price" hundreds of years after it is acquired - or never !

*Every even integer number can be expressed as the sum of two prime numbers*. NOBODY will "use" this conjecture ( still unproved ), ever ! However, thousands of people, for the last 250 years, who

*study* numbers, are "wasting" their lives trying to "see" the truth of this most simple fact, beyond any "practical" reason.