It is clear enough (because of above post), but I would like to add one thing. There is NO metric units ever in AcesHigh. And HiTech made it clear that the game would never have metric system. so, anything you see in the game would be something of a Imperial Units... weight, speed, height, distance, etc.
One funny thing on Imperial System is (or rather one neat thing in metric system is) that all those values have no connection/relation ever. Weight has no relation with distnace, speeds and distances are using different units .. In metric system, if you have 1m x 1m volume of pure water, it would be 1000kg. The only measure of distance and speed is based on meters... etc.