Liquids and gases have different viscosities because of the difference in the internal friction between their molecules. Viscosity is a function of the structure of a substance and its temperature. It is to be experimentally determinded here by measuring the rate of fall of a ball in a tube filled with the liquid to be investigated.
a) of a methanol-water mixtures of various composition at a constant temperature,
b) of water as a function of the temperature and
c) of methanol as a function of temperature.
From the temperature dependence of viscosities, calculate the energy barriers to overcoming the internal friction of water and methanol.
| Materiallist (Excerpt) |
Product |
Amount |
|
Set of Precision Balance Sartorius CPA 623S and measure software, 230 V
|
49224-88
|
1
|
|
Falling ball viscometer
|
18220-00
|
1
|
|
Immersion thermostat Alpha A, 230 V
|
08493-93
|
1
|
|
Thermometer,24..+51C,f.18220.00
|
18220-02
|
1
|
|
Bath for thermostat, Makrolon
|
08487-02
|
1
|
|
External circulation set for thermostat Alpha A
|
08493-02
|
1
|
|
Retort stand, h 750 mm
|
37694-00
|
1
|
|
Pyknometer, calibrated, 25ml
|
03023-00
|
1
|
|
Stopwatch, digital, 1/100 s
|
03071-01
|
1
|
|
Water, distilled 5 l
|
31246-81
|
1
|
|
Universal clamp with joint
|
37716-00
|
1
|
|
Methanol 500 ml
|
30142-50
|
2
|
|
Pasteur pipettes, 250 pcs
|
36590-00
|
1
|
|
Volumetric flask 100 ml, IGJ12/21
|
36548-00
|
9
|
|
Right angle clamp
|
37697-00
|
1
|
|
Rubber caps, 10 pcs
|
39275-03
|
1
|
|
Glass beaker DURAN®,tall, 150 ml
|
36003-00
|
11
|
|
Glass beaker DURAN®, short , 250 ml
|
36013-00
|
1
|
|
Hose clamp for 5-12 mm diameter
|
40997-00
|
10
|
|
Rubber tubing, i.d. 10 mm
|
39290-00
|
1
|
|
Wash bottle, plastic, 500 ml
|
33931-00
|
2
|
|
Rubber tubing, i.d. 6 mm
|
39282-00
|
6
|
|
Tubing connector, ID 6-10mm
|
47516-01
|
2
|
|
Laboratory Experiments Physics, Chemistry, Biology andApplied Sciences, CD-ROM, incl. operating manuals
|
16502-42
|
1
|
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