I couldn't resist having a go myself! Below is my modified list of conversion factors; I've tried to be clear from where each has come. I've left the original ones in, commented out, so that the two can be compared.
Code:
struct _constsml conversions[] = {
// CONV("kg", "lb", "KG_LBM", "0.4535924"), // source: NIST
CONV("kg", "lb", "KG_LBM", "0.45359237"), // source: NIST; exact
// CONV("kg", "stone", "KG_STONE", "6.3502936"), // derived: 14 lbs to a stone
CONV("kg", "stone", "KG_STONE", "6.35029318"), // derived: 14 lbs to a stone using exact lb; exact
// CONV("kg", "cwt", "KG_CWT", "50.8023488"), // derived: 112lb to a long cwt
CONV("kg", "cwt", "KG_CWT", "50.80234544"), // derived: 112lb to a long cwt using exact lb;exact
// CONV("kg", "s.cwt", "KG_SHCWT", "45.35924"), // source: NIST hundredweight, short 100lb
CONV("kg", "s.cwt", "KG_SHCWT", "45.359237"), // source: NIST hundredweight, short 100lb using exact lb; exact
// CONV("g", "oz", "G_OZ", "28.34952"), // source: NIST
CONV("g", "oz", "G_OZ", "28.349523125"), // source: NIST; 16oz to 1 lb using exact lb
// CONV("g", "tr.oz", "G_TOZ", "31.10348"), // source: NIST
CONV("g", "tr.oz", "G_TOZ", "31.1034768"), // source: NIST; 1 tr.oz = 480 grains; 1 lb = 7000 grains exactly; exact
CONV("l", "galUK", "L_GALUK", "4.54609"), // source: NIST; also UK Weights and Measures act 1985; exact
// CONV("l", "galUS", "L_GALUS", "3.785412"), // source: NIST
CONV("l", "galUS", "L_GALUS", "3.785411784"), // source: NIST handbook 44 2017 appendix C; exact
// CONV("l", "cft", "L_CUBFT", "28.31685"), // source: NIST
CONV("l", "cft", "L_CUBFT", "28.316846592"), // source: 1 inch = 0.0254 m; exact
// CONV("ml", "flozUK", "ML_FLOZUK", "28.41306"), // source: NIST oz UK fluid
CONV("ml", "flozUK", "ML_FLOZUK", "28.4130625"), // source: 1 ukgallon = 8 pints; 1 pint = 20 flozuk; see above for exact ukgallon; exact
// CONV("ml", "flozUS", "ML_FLOZUS", "29.57353"), // source: NIST oz US fluid
CONV("ml", "flozUS", "ML_FLOZUS", "29.5735295625"), // source: NIST handbook 44 2017 appendix C; 1 floz = 1.8046875 in^3; exact
CONV("cm", "inches", "CM_INCH", "2.54"), // source: NIST; exact already
CONV("m", "fathom", "M_FATHOM", "1.8288"), // derived: 6 feet; exact
CONV("m", "feet", "M_FEET", "0.3048"), // source: NIST; exact
// CONV("m", "feetUS", "M_FEETUS", "0.3048006096"), // source: Wikipedia etc;
CONV("m", "feetUS", "M_FEETUS", "0.3048006096012192"), // source: Wikipedia etc; usfoot = survey foot = 1200/3937 m exactly; number given is correct to 16sf
CONV("m", "yards", "M_YARD", "0.9144"), // source: NIST; exact
CONV("km", "miles", "KM_MILE", "1.609344"), // source: NIST; exact
CONV("km", "l.y.", "KM_LY", "9.4607304725808E12"), // source: IAU (see http://www.hpmuseum.org/forum/thread-2262.html); exact
// CONV("km", "pc", "KM_PC", "3.085678E13"), // source: NIST
CONV("km", "pc", "KM_PC", "3.085677581491367E13"), // source: August 2015 IAU Resolution B2 defines parsec as 648000/pi AU; uses AU below; correct to 16sf
// CONV("km", "AU", "KM_AU", "149597900"), // source: NIST, IAU 2009 gives 1.49597870700E11
CONV("km", "AU", "KM_AU", "149597870.7"), // source: NIST, IAU 2009 gives 1.49597870700E11; value changed to this exact definition
CONV("km", "nmi", "KM_NMI", "1.852"), // source: NIST; exact
// CONV("m\232", "square", "M_SQUARE", "9.290304"), // derived:
// CONV("m\232", "perch", "M_PERCH", "25.29285264"), // derived:
CONV("ha", "acres", "HA_ACREUK", "0.40468564224"), // derived: 43560 square feet; exact
// CONV("ha", "acreUS", "HA_ACREUS", "0.4046873"), // source: NIST
CONV("ha", "acreUS", "HA_ACREUS", "0.4046872609874252"), // source: NIST; using exact definition of survey foot correct to 16sf
// CONV("N", "lbf", "N_LBF", "4.448222"), // source: NIST
CONV("N", "lbf", "N_LBF", "4.4482216152605"), // source: using g (standard) = 9.80665 N/kg from NIST constants and exact value for mass of 1lb; exact
// CONV("J", "Btu", "J_BTU", "1055.056"), // source: NIST BTUit
CONV("J", "Btu", "J_BTU", "1055.05585262"), // source: NIST; 1BTU = heat needed to raise temp of 1 lb water by 1 degF; using exact pound and calorie values gives result above
CONV("J", "cal", "J_CAL", "4.1868"), // source: NIST calorie it (International Steam Table calorie); exact
CONV("J", "kWh", "J_kWh", "3600000"), // source: NIST; exact
CONV("Pa", "atm", "Pa_ATM", "101325"), // source: NIST atmosphere standard; exact
CONV("Pa", "bar", "Pa_bar", "100000"), // source: NIST; exact
// CONV("Pa", "mmHg", "Pa_mmHg", "133.3224"), // source: NIST cm mercury conventional
CONV("Pa", "mmHg", "Pa_mmHg", "133.322387415"), // source: Wikipedia refers to BS 350: Part 1: 1974 - Conversion factors and tables. British Standards Institution. 1974. p. 49; exact
// CONV("Pa", "psi", "Pa_psi", "6894.757"), // source: NIST pound-force per square inch
CONV("Pa", "psi", "Pa_psi", "6894.757293168361"), // source: NIST pound-force per square inch; uses value for lbF above; correct to 16sf
// CONV("Pa", "inHg", "Pa_inhg", "3386.389"), // source: NIST inch of mercury conventional
CONV("Pa", "inHg", "Pa_inhg", "3386.388640341"), // source: NIST inch of mercury conventional; see mmHg above; exact
// CONV("Pa", "torr", "Pa_torr", "133.3224"), // source: NIST
CONV("Pa", "torr", "Pa_torr", "133.3223684210526"), // source: NIST; 101325/760 is exact value; corect to 16sf
// CONV("W", "hp(I)", "W_HP550", "745.6999"), // source: NIST horsepower 550 ft . lb / s
CONV("W", "hp(I)", "W_HP550", "745.6998715822702"), // source: NIST horsepower 550 ft . lb / s; using standard g; correct to 16sf
// CONV("W", "hp(M)", "W_HP", "735.4988"), // source: NIST horsepower metric
CONV("W", "hp(M)", "W_HP", "735.49875"), // source: NIST horsepower metric (lifting 75kg 1m in 1s) using standard g; exact
CONV("W", "hp(E)", "W_HPe", "746"), // source: NIST horsepower electric; exact
// CONV("t", "tons", "T_TON", "1.016047"), // source: NIST ton, long 2240lb
CONV("t", "tons", "T_TON", "1.0160469088"), // source: NIST ton, long 2240lb; using exact lb; exact
// CONV("t", "s.tons", "T_SHTON", "0.9071847"), // source: NIST ton, short 2000lb
CONV("t", "s.tons", "T_SHTON", "0.90718474"), // source: NIST ton, short 2000lb; using exact lb; exact
CONV(NULL, NULL, NULL, NULL)
};
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WP-34S galUS-> l Precision
