That's the approximate mass of an electron, written in scientific notation.
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9 x 10^-31 kg is the same as 9 multiplied by 0.00000000000000000000000000000001 kg, which equals 0.00000000000000000000000000000009 kg.
No, 198 g is not equal to 9 kg. 1 kg equals 1000 g, so 9 kg is equal to 9000 g.
9 kilograms a day equals 270 kilograms in a 30-day month (9 kg/day x 30 days = 270 kg/month).
9 kg is greater than 90 g. 1 kg is equal to 1000 g, so 9 kg is equivalent to 9000 g.
60 kg = 9 st and 6.27 lb60 kg = 9 st and 6.27 lb60 kg = 9 st and 6.27 lb60 kg = 9 st and 6.27 lb60 kg = 9 st and 6.27 lb60 kg = 9 st and 6.27 lb
9 × 10^13 J