"lbs" (pounds) is a measure of force, whereas "kgs" (kilograms) is
a measure of mass. Being different units with different physical
dimensions, they can never be 'equal'.
-- 47 lbs is the weight of 64.9 kgs of mass on Mars.
-- 47 lbs is the weight of 128.8 kgs of mass on the Moon.
-- 47 lbs is the weight of 21.3 kgs of mass on Earth.
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etc.
