King henry doesn't usually drink chocolate milk is what we call a mnemonic; It's a phrase that's designed to help you remember something important. Terms in this set (8) what is the mnemonic phrase used to remember the metric prefixes? King henry doesn't usually drink chocolate milk. 10 x 10 x 10 x. Km = kilometre kl = kilolitre kg = kilogram kw = kilowatt kpa = kilopascal kn= kilonewton. Hm = hectometre hl = hectolitre. once upon a time, in the land of metricsville, king henry was known for…