Assertion: metric system's unit | /r/HasProperty | n·s
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Source sentences:
text: The root cause of NASA's 1999 loss of the $125 million Mars Climate Orbiter which crashed into Mars was a mismatch of units - the spacecraft engineers calculated the thrust forces required for velocity changes using US customary units (lbf·s) whereas the team who built the thrusters were expecting a value in metric units (N·s) as per the agreed specification.