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1 m/s -

2.2 miles per hour (-2%, ±<1%) 2 miles per hour (-10%, ±<1%)

2.237	±<<1%	Vade p10
2.2	-2%, ±<1%
2	-10%, ±<1%
1	-55%, ±<1%

c speed of light in vacuum -

3 × 108 m/s (±<<1%)

2.998 × 108	±<<1%	Vade p4
3 × 108	±<<1%
108	-×2/3, ±<1%
109	+×2.3, ±<1%