Other Non-SI Units

Nonetheless, it is recognized that some non-SI units still appear widely in the scientific, technical, and commercial literature, and some will probably continue to be used for many years. Other non-SI units, such as the units of time, are so widely used in everyday fife and are so deeply embedded in the history and culture of human beings that they wiU continue to he used for the foreseeable future. For these reasons, some of the more irr5)ortant non-SI units are fisted. 

In 1996 the CIPM agreed upon a categorization of the units used with the SI into three groups units accepted for use with the SI, units accepted for use with the SI whose values are obtained experimentally, and other units currently accepted for use with the SI to satisfy the needs of special interests. The three groups are listed in Tables 1.2-8-1.2-10. 

Certain other non-SI units are still occasionally used. Some are important for the interpretation of older scientific texts. These are fisted in Tables 1.2-11 —1.2-16, but their use is not encouraged. 

ISO 31 recommends that the degree be subdivided decimally rather than using the minute and second. 

Unfortunately, printers from all over the world seem not to be willing to admit that in some texts it would be very helpful to have distinguishable symbols for the number 1 and the letter 1 . Giving up any further discussion, the 16th CGPM therefore decided in 1979 that the symbol L should also be adopted to indicate the unit litre in order to avoid the risk of confusion between the number 1 and the letter 1 . 

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Conversion Factors for UK Imperial Units and Other Non-SI Units OF Measurement... 

The minute, hour, and day have had such long-standing use in everyday life that it is unlikely that new SI units derived from the second could supplant them. Some other non-SI units are still accepted, although they are rarely used by most individuals in their daily lives but have been very important in some specialized fields. Examples of such units are the nautical mile, knot, and hectare. Examples of non-SI units retained for use with the SI are illustrated in Table 1-4. 

Examples of other non-SI units found in the older literature and... 

Table 1.2-10 lists some other non-SI units which are currently accepted for use with the SI to satisfy the needs... 

Table1.2-10 Other non-SI units currently accepted for use with the International System...

In this book the only units of measure used for describing physical quantities and properties of materials are those recommended by the Systhme International d Unitis (SI). For accurate conversion factors between these units and the other non-SI units (e.g., cgs, fps. Imperial, and US customary), please refer to the reference book by the same author ... 

Examples of other non-SI units found in the older literature and their relation to the SI are given below. Use of these units in current texts is discouraged. 

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