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PRACTICAL |
LABORATORY INFORMATION |
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11.137 |
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11.8 SIEVES AND SCREENS |
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TABLE 11.53 |
U.S. Standard Sieve Series |
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Sieve opening |
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Sieve opening |
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Sieve no. |
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mm |
inch |
Sieve no. |
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mm |
inch |
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125 |
5.00 |
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10 |
2.00 |
0.0787 |
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106 |
4.24 |
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12 |
1.70 |
0.0661 |
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90 |
3.50 |
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14 |
1.40 |
0.0555 |
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75 |
3.00 |
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16 |
1.18 |
0.0469 |
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63 |
2.50 |
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18 |
1.00 |
0.0394 |
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53 |
2.12 |
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20 |
0.850 |
0.0331 |
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45 |
1.75 |
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25 |
0.710 |
0.0278 |
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37.5 |
1.50 |
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30 |
0.600 |
0.0234 |
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31.5 |
1.25 |
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35 |
0.500 |
0.0197 |
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26.5 |
1.06 |
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40 |
0.425 |
0.0165 |
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22.4 |
0.875 |
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45 |
0.355 |
0.0139 |
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19.0 |
0.75 |
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50 |
0.300 |
0.0117 |
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16.0 |
0.625 |
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60 |
0.250 |
0.0098 |
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13.2 |
0.530 |
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70 |
0.212 |
0.0083 |
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11.2 |
0.438 |
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80 |
0.180 |
0.0070 |
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9.5 |
0.375 |
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100 |
0.150 |
0.0059 |
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8.0 |
0.312 |
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120 |
0.125 |
0.0049 |
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6.7 |
0.265 |
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140 |
0.106 |
0.0041 |
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3.5 |
5.60 |
0.223 |
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170 |
0.090 |
0.0035 |
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4 |
4.75 |
0.187 |
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200 |
0.075 |
0.0029 |
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5 |
4.00 |
0.157 |
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230 |
0.063 |
0.0025 |
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6 |
3.35 |
0.132 |
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270 |
0.053 |
0.0021 |
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7 |
2.80 |
0.111 |
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325 |
0.045 |
0.0017 |
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8 |
2.36 |
0.0937 |
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400 |
0.038 |
0.0015 |
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Specifications are from ASTM E.11-81/ISO 565. The sieve numbers are the approximate number of openings per linear inch.
11.9 THERMOMETRY
11.9.1Temperature and Its Measurement
The new international temperature scale, known as ITS-90, was adopted in September 1989. How- |
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ever, neither the definition of thermodynamic temperature nor the definition of the kelvin or the |
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Celsius temperature scales has changed; it is the way in which we are to realize these definitions |
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that has changed. The changes concern the recommended thermometers to be used in different |
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regions of the temperature scale and the list of secondary standard fixed points. The changes in |
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temperature determined using ITS-90 from the previous IPTS-68 are always less than |
and |
0.4 K, |
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almost always less than |
over0.2theK,range |
0– 1300 K. |
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The ultimate definition of thermodynamic temperature is in terms of |
pV (pressure |
volume) |
in |
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a gas thermometer extrapolated to low pressure. The kelvin (K), the unit of thermodynamic tem- |
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perature, is defined by specifying the temperature of one fixed point on the |
triple pointscale— the |
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