You do not need "white rods", you need a tape measure or a ruler to measure the lenght of your thumb.
One.
Length / Width
A digit is like a finger or thumb. Each limb has 5 digits. 4 fingers and 1 thumb or a big toe and 4 other toes.
Rule of thumb... about half. Approx 2cm to 1inch
There will be Length/Width widths in 1 length. This will normally be a number that is greater than 1.
Impossible to convert a volume meaure to length measure
You cant meaure this because liters is a way of measuring liquid and meters is a way of measuring length
impossible to convert a length meaure (kilometers) to a volume measure (milliliters) However, If you mean Millimeters then there are 4,200,000 mm in 4.2 km
It is how many steps back you are from the object that is receiving the sound
im not sure but i think its six
length and distance
Well, the term is hectare, not hector. And a hectare is a meaure of AREA- not length. It is 10,000 square meters. As in 100 meters long by 100 meters wide. or 50 meters by 200 meters, etc. You can't really measure it in inches. Sorry.
The general rule of thumb is that one inch of draw length will increase your speed by approximately 10 fps. This will vary from bow to bow and depends a lot on the draw length and poundage being changed.
7-10 times
The human thumb has two phalanges.
Two
The rule of thumb is 12. It's not precisely true, but it's close enough that it won't ruin your recipe.