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joules per kilogram or Jlkg or J . kg-'
but not jouleslkilogram or jouleslkg or joules . kgp1.
5.4.1 The preferred decimal marker is a point on the
line (period); however, the comma is also acceptable. When
writing numbers less than one, a zero should be written
before the decimal marker.
5.4.2 The comma is not to be used to separate digits.
Instead, digits should be separated into groups of three,
counting from the decimal point towards the left and the
right, and using a small space to separate the groups. For
example:
The space between groups should be approximately the
width of the letter "i" and the width of the space should be
constant even if, as is often the case in printing, variablewidth
spacing is used between the words.
5.4.3 The sign for multiplication of numbers is a
cross ( X ) or a dot half high. However, if the dot half high is
used as the multiplication sign, a point on the line must not
be used as a decimal marker in the same expression.
5.4.4 Attachment of letters to a unit symbol as a
means of giving information about the nature of the quantity
under consideration is incorrect. Thus MWe for "megawatts
electrical (power)", Vas for "volts ac" and kJt for
"kilojoules thermal (energy)" are not acceptable. For this
reason, no attempt should be made to construct SI
equivalents of the abbreviations "psia" and "psig", so often
used to distinguish between absolute and gauge pressure. If
the context leaves any doubt as to which is meant, the word
pressure must be qualified appropriately. For example:
". . .at a gauge pressure of 13 kPa".
or ". . .at an absolute pressure of 13 kPa"
ATTACHMENT C.--CONVERSION FACTORS
1.1 The list of conversion factors which is
contained in this Attachment is provided to express the
definitions of miscellaneous units of measure as numerical
multiples of SI units.
1.2 The conversion factors are presented for ready
adaptation to computer read-out and electronic data
transmission. The factors are written as a number greater
than 1 and less than 10 with six or less decimal places. This
number is followed by the letter E (for exponent), a plus'or
minus symbol, and two digits which indicate the power of 10
by which the number must be multiplied to obtain the
correct value. For example:
3.523 907 E-02 is 3.523 907 x or 0.035 239 07
Similarly,
1.3 As asterisk (*) after the sixth decimal place
indicates that the conversion factor is exact and that all
subsequent digits are zero. Where less than six decimal
places are shown, more precision is not warranted.
1.4 Further examples of use of the tables:
To con wrt ,from to Multiply by
pound-force per square foot Pa 4.788 026 E+01
inch m 2.540 000*E-02
thus:
1 Ibf/ft2 = 47.880 26 Pa
1 inch = 0.025 4 m (exactly)
2.-Factors not listed
2.1 Conversion factors for compound units which
are not listed herein can easily be developed from numbers
given in the list by the substitution of converted units, as
follows.
Example: To find conversion factor of Ib . ftls to kg . mls:
,first convert
1 Ib to 0.453 592 4 kg
1 ft to 0.304 8 m
then substitute:
(0.453 592 4 kg) X (0.304 8 m)/s
= 0.138 255 kg. mls
Thus the factor is 1.382 55 E-01.
Table C-1 .-Conversion factors to SI units
(Symbols of SI units given in parentheses)
--
To convert from to Multiply by
abampere
abcoulom b
abfarad
abhenry
abmho
abohm
abvolt
acre (U.S. survey)
ampere hour
are
atmosphere (standard)
atmosphere (technical = 1 kgf/cm2 )
bar
barrel (for petroleum, 42 U.S. liquid gal)
ampere (A)
coulomb (C)
farad (F)
henry (HI
siemens (S)
ohm (a)
volt (V)
square metre (m2)
coulomb (C)
square metre (m2 )
pascal (Pa)
pascal (Pa)
pascal (Pa)
cubic metre (m3 )
An asterisk (*) after the sixth decimal place indicates that the conversion factor is exact and that all subsequent digits are zero. Where less
than six decimal places are shown, more precision is not warranted.
2611 1/81 24 ANNEX 5
Annex 5 - Units ofMeasurement to be used in Air
Attachment C and Ground Operations
Table C-1 (cont.)
To convert from
British thermal unit (International Table)
British thermal unit (mean)
British thermal unit (therrnochemical)
British thermal unit (39OF)
British thermal unit (59OF)
British thermal unit (60O~)
Btu (International Table) . ft/he ft2 . OF
　
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