Originally Posted by Glenn Baglo
As in, my boat travels at 6 knots, not 6 knots per hour.
Originally Posted by Lora
And yet we say, I drive at 60 miles/kilometers per hour, not at 60 miles/kilometers.
Right Lora, because miles and kilometres are units of distance, so "per hour" is needed to make a unit of speed; in contrast, "knot
" is already a unit of speed by itself, so no "per hour" is added.
Glenn, this is why I said the knot example wouldn't help most members understand (it just confuses them further)... because they don't already know that a "nautical mile" is the unit of distance while a "knot" is a unit of speed, equal to one nautical mile per hour.