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J Am Med Inform Assoc 6:151-162 doi:10.1136/jamia.1999.0060151
  • Original Investigation

Units of Measure in Clinical Information Systems

Table 3

Definition of Special Units on Nonratio Scales

u′ u ν f(x) f-1(x)
1°C 1 K 1 x - 273.15 x + 273.15
1°F 1 K 5/9 x - 459.67 x + 459.67
pH 1 mol/L 1 -log10x 10-x
1 Np 1 1 ln x ex
1 bel 1 1 log10x 10x
1 db(SPL) 1 Pa 2 × 10-5 20 · log10x 10x/20
1 db(mV) 1 mV 1 20 · log10x 10x/20
1 db(W) 1 W 1 10 · log10x 10x/10

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