When non-metric units were used in the United Kingdom, a unit of mass called the pound-mass (lbm) was employed, where 1 lbm=0.4539 kg.
(a) If there is an uncertainty of 0.0001 kg in the pound-mass unit, what is its percent uncertainty?
(b) Based on that percent uncertainty, what mass in pound-mass has an uncertainty of 1 kg when converted to kilograms?
a) The percent uncertainty of the lbm is
b) For an uncertainty of 1 kg, the corresponding lbm is