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Conversion tables

Key information for the working scientist

As a trusted partner with a passion for science, Avantor® offers a broad array of useful conversion tables and formulas to help your research and production to set science in motion.

    Particle size 1

    Sieve "Mesh"Sieve Opening
     InchesMillimeters
    11.0025.4
    7/80.87522.6
    3/40.75019.0
    5/80.62516.0
    .5300.53013.5
    1/20.50012.7
    7/160.43811.2
    3/80.3759.51
    5/160.3128.00
    .2650.2656.73
    1/40.2506.35
    3 1/20.2235.66
    40.1874.76
    50.1574.00
    60.1323.36
    70.1112.83
    80.09372.38
    100.07872.00
    120.06611.68
    140.05551.41
    160.04691.19
    180.03941.00
    200.03310.841
    250.02780.707
    300.02340.595
    350.01970.500
    400.01650.420
    450.01390.354
    500.01170.297
    600.00980.250
    700.00830.210
    800.00700.177
    1000.00590.149
    1200.00490.125
    1400.00410.105
    1700.00350.088
    2000.00290.074
    2300.00250.063
    2700.00210.053
    3250.00170.044
    4000.00150.037

    1. Large sieve opening (1 to 1/4 inch) have been designated a sieve "mesh" size that corresponds to the size of the opening in inches.

    Sieve "mesh" sizes of 31/2 and higher are designated by the number of openings per linear inch in the sieve.

    Note: To convert millimeters to microns, move decimal point three places to the right. Example: 0.125 millimeters converts to 125 microns.

    Acid / Base Concentrations

    Composition of concentrated reagent-grade acids, ammonium hydroxide, and sodium and potassium hydroxide solutions (with dilution directions to 1M and 1N solutions)

    ChemicalFormula Weight of ReagentaApproximate DensityApproximate Strength of Concd. ReagentbAssay Limits % w/wMolarity of Concd. ReagentMilliliters of Concd. Reagent Necessary to Prepare 1 Liter of 1 Molar SolutioncNormality of Concd. ReagentMilliliters of Concd. Reagent Necessary to Prepare 1 Liter of 1 Normal Solutionc
    Acetic Acid (CH3COOH)60.0521.0599.899.7–99.917.457.517.457.5
    Formic Acid (HCOOH)46.0261.139088.0–92.023.642.523.642.5
    Hydrochloric Acid (HCI)36.4611.1837.236.5–38.012.182.512.182.5
    Hydrofluoric Acid (HF)20.0061.194948.0–51.028.934.528.934.5
    Nitric Acid (HNO3)63.0131.4169.669.0–70.015.66415.663
    Perchloric Acid (HCIO4)100.4581.6770.570.0–72.011.785.511.785.5
    Perchloric Acid (HCIO4)100.4581.6761.360.0–62.09.5105.59.5105.5
    Phosphoric Acid (H3PO4)97.9951.7185.585.0–87.014.867.544.422.5
    Sulfuric Acid (H2SO4)98.0731.849695.0–98.01855.53628
    Ammonium Hydroxide (NH4OH)35.0460.9056.6d14.56914.569
    Sodium Hydroxide (NaOH)39.9971.5350.550.0–52.019.451.519.451.5
    Potassium Hydroxide (KOH)56.1051.454545.0–46.011.785.511.785.5

    a. Based on atomic weight table (32C = 12).
    b. Representative value, w/w %.
    c. Rounded to nearest 0.5 ml.
    d. Equivalent to 28.0 % w/w NH3.