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5 Determining density of liquids
For density determination of liquids, a glass sinker is used, whose volume is known.
The glass sinker is weighed first in air and then in the liquid whose density is to be
determined. From the weight difference results the buoyancy from where the
software calculates the density.
5.1
Determine volume of the glass sinker
If the volume of the glass sinker is unknown, it must be determined and calculated as
follows.
1. Fill distilled water into the container and heat it until the temperature is constant.
Read temperature on the thermometer.
2. Call-up weighing mode. If weighing balance does not show Zero, press TARE.
3. Suspend the glass sinker. The weight of the drop shaft in air will be displayed.
4. Wait for the stability display ( ), then confirm by pressing TARE.
5. Place the water container on the platform and immerse the glass sinker. Wait for
stability display ( ). The balance displays the difference „weight in air – weight in
water".
Note the value (without sign) and calculate the volume of the glass sinker according
to the following formula.
V
= volume of glass sinker
M
= difference „weight in air – weight in water"
ρ
= density of water considering the temperature, see table 1.
Tab. 1: Density table of water
Temperature
Density
ρ
[℃]
10
0.9997
11
0.9996
12
0.9995
13
0.9994
14
0.9993
15
0.9991
16
0.9990
17
0.9988
18
0.9986
ACS-A03-BA-e-1210
M
V =
ρ
Temperature
3
[g/cm
]
[℃]
19
20
21
22
23
24
25
26
27
ρ
Density
Temperature
3
[g/cm
]
[℃]
0.9984
28
0.9982
29
0.9980
30
0.9978
31
0.9976
32
0.9973
33
0.9971
34
0.9968
35
0.9965
ρ
Density
3
[g/cm
]
0.9963
0.9960
0.9957
0.9954
0.9951
0.9947
0.9944
0.9941
13
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