[tlhIngan Hol] weight of cheb

Hello, I know that {cheb} is defined as "roughly 5 lbs" in Okrand's Usenet message. And the BoP poster mentions the weight of {cheb'a'} in the following relationship: 375,000 cheb'a' = 8.7 KT I remember reading that 1 {cheb'a'} might be 9 {cheb}, but no matter what I calculate, I don't get it – so where's my error? -- Lieven L. Litaer aka the "Klingon Teacher from Germany" http://www.tlhInganHol.com http://klingon.wiki/En/Measurements