Unit Conversion Charts for the Analytical Chemist

chemical analysis measurements
Chemical analysis measurements

An analytical chemist needs to express analytical data in units which may require conversion to other units for ease of calculation and communication of results. Most modern analytical techniques are capable of expressing results in different units at the push of a button but a basic understanding of inter-conversions and factors involved is essential to gain confidence on results that you communicate.

Measurement units commonly used in analytical work introduced you to the common units that you come across while doing your routine analysis. However, it would be a big help if you have ready access to the interconversion charts. In the present article simple interconversion charts are presented on units that you are likely to come across during routine laboratory activities.

Length

FromTo

Conversion Factor

cmmm10
cmm10-1
mcm102
mmµm103
µmmm10-3

 

 

 

 

 

 

 

 

 

                                                    Time
FromTo

Conversion factor

secm sec103
secµsec106
secnano sec109
secPico sec1012
m secsec10-3
µ secsec10-6
nanosecsec10-9
pico secsec10-12

 

 

 

 

 

 

 

 

 

 

 

 

Mass

FromToConversion Fcator
gmmg103
gmµg106
gmηg109
gmpg1012
mggm10-3
µggm10-6
ηggm10-9
pggm10-12

 

Volume

FromTo

Conversion Factor

litml103
litµl106
mllit10-3
mlµl103
µlml10-3
µllit106
Temperature
FromToConversion Factor
OCOF(OC-32)x 5/9
OFOC(OCx9/5)+32
OCOKOC+273.15
Heat
FromToConversion Factor
caloriesmilli calories103
caloriesjoules4.184
joulescalories0.239
Electrical Units
FromToConversion Factor
amperesmilliamperes103
milli amperesamperes10-3
amperesmicro amperes106
micro amperesamperes10-6
voltsmillivolts103
voltsmicrovolts106

Concentration

FromToConversion Factor
molesmillimolesX103
millimolesmolesX10-3
ppm (mg/l)ppb(µg/l)X103
ppm (mg/l)ppt (ηg/l)X106
ppbppmX10-3
pptppm

X10-6

Pressure

FromToConversion Factor
barpascal105
barpsi14.50
pascaltorr0.0075
torrpascal133.32
mm of Hgatmosphere0.00132
mm of Hgpascal133.32
mm of Hgtorr1
psibar0.0689
psipascal6894.75
psitorr51.72
psimm of Hg

51.72

Wavelength

FromToConversion Factor
metersµm106
µmmeters10-6
cmµm104
µmcm10-4
λ µmwavenumber (cm-1)104/ λ (m µ)
wavenumber (cm-1)λ µm

104/ / λ (cm-1 )

The charts would serve as a ready reference and will save your valuable time spent otherwise searching for conversion factors. Hopefully the information would prove to be useful.

Please feel free to offer your comments on the compilation.

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