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When non-metric units were utilized in the UK, a unit of mass called the pound mass (lbm) was employed, where 1 lbm = 0.4539kg.
1. If there is an uncertainty of 0.0001kg in the pound-mass unit, what is the percent uncertainty?
2. Based on that percent uncertainty, what mass in pound-mass has an uncertainty of 1kg when converted to kg?
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