Mettler Toledo 33360 Mode D'emploi page 6

3. Accuracy of density determination
The required accuracy of the result determines whether any factors will be taken into account. The following listing
should make it possible to quantitatively evaluate the influence of these factors.
3.1 Temperature
In the case of solid bodies, the change in density caused by a change in temperature is generally so small that
the temperature of a solid body can be disregarded as far as density determination is concerned (this also applies
to sinkers).
In the case of liquids, however, the density may change on the order of 0.1 ... 1 %
appear at the third decimal place.
Example: Distilled water:
Hydrocarbons + alcohols:
It should be noted that such a change in the density of a liquid is directly taken into account when the density of
solid bodies is being determined because of the test liquid in which the solid body has to be immersed. For this
reason, the temperature of the liquid must always be taken into consideration when the density is to be
determined with better than 1 % accuracy.
Density table for distilled water:
(according to "Handbook of Chemistry and Physics" 66th Ed. 1985-1986, F4-F5)
Temperature (°C)
15.0
15.5
16.0
16.5
17.0
17.5
18.0
18.5
19.0
19.5
20.0
20.5
21.0
21.5
22.0
22.5
23.0
23.5
For all other liquids, the density at temperature T must be taken from a book of tables.
4
Density (g/ ml)
0.9991
0.9990
0.9990
0.9989
0.9988
0.9987
0.9986
0.9985
0.9984
0.9983
0.9982
0.9981
0.9980
0.9979
0.9978
0.9977
0.9975
0.9974
pro °C, and this may already
o
Density change about 1 %
Density change about 1 %
Temperature (°C)
24.0
24.5
25.0
25.5
26.0
26.5
27.0
27.5
28.0
28.5
29.0
29.5
30.0
30.5
31.0
31.5
32.0
METTLER TOLEDO 33360 + 210260
per 5 °C
o
per 1 °C
o
Density (g/ ml)
0.9973
0.9972
0.9970
0.9969
0.9968
0.9966
0.9965
0.9964
0.9962
0.9961
0.9959
0.9958
0.9956
0.9955
0.9953
0.9952
0.9950