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UDC 668.5
IS0
I N T E R N AT1 O N AL O R G A N I Z AT1 O N
F O R STAN DAR D I2 AT I O N
IS0 RECOMMENDATION
R 279
DETERMINATION OF THE DENSITY AND
RELATIVE DENSITY OF ESSENTIAL OILS
1st EDITION
November 1962
COPYRIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
by the national standards organization of that country, being
a member of ISO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
The IS0 Recommendation R 279, Determination of the Density and Relative Density of
Essential Oils, was drawn up by Technical committee ISO/TC 54, Essential Oils, the Secretariat
of which is held by the Repartiçao de Normalizaçao (IGPAI).
Work on this question by the Technical Committee began in 1953 and led, in 1957, to the
adoption of a Draft IS0 Recommendation.
This first Draft IS0 Recommendation (No. 87) was circulated to all the IS0 Member Bodies
for enquiry. As the results of this consultation were not considered satisfactory, the Technical
Committee presented a second Draft IS0 Recommendation, which was circulated to all the
Member Bodies in April 1960 and was approved by the following Member Bodies:
Australia Greece Portugal
Austria Israel Romania
Belgium Italy Spain
Burma Japan Sweden
Mexico United Kingdom
Chile
Czechoslovakia Netherlands U.S.S.R.
France New Zealand Yugoslavia
Two Member Bodies opposed the approval of the Draft:
Canada India.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0 Council,
which decided, in November 1962, to accept it as an IS0 RECOMMENDATION.
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ISO/R 279 - 1962 (E)
IS0 Recommendation R 279 November 1962
DETERMINATION OF THE DENSITY AND
RELATIVE DENSITY OF ESSENTIAL OILS
1. SCOPE
This IS0 Recommendation specifies the reference method to be used in determining the density
and relative density of essential oils, liquid at the temperature of 20 OC.
2. DEFINITIONS
2.1 Density (mass density) at 20 OC of an essential oil means the ratio of the mass of a given
volume of the oil at 20 "C to this volume.
p 20.
This quantity is expressed in grammes per millilitre and its symbol is
2.2 Relative density* at 20 "C or at 4 "C of an essential oil means the ratio of the density of the
oil at 20 "C to that of distilled water at 20 OC or at 4 OC.
This quantity is dimensionless and its symbol is di: or d 7.
All weighings are made in air.
3. PRINCIPLE OF THE METHOD
Since this IS0 Recommendation requires values accurate to three decimal places, a pycnometer
is used for weighing equal volumes of the liquids in question, in order to obviate the use of large
volumes of liquid
...