An iris diaphragm is used to bundle the light from a torch, which is then passed through a glass beaker filled with sample solution. In a pure sodium chloride solution, the beam of light is invisible. In a polymer solution, however, scattered light is clearly visible from the side. This so-called 'Tyndall effect' occurs only if the size of the dissolved particles falls within the range of the wavelength of visible light. The test procedure describes how to proceed using a polymer solution, but the test can also be run for a biology class in the same way using a filtered egg white solution.
| Materiallist (Excerpt) |
Product |
Amount |
|
Sample set for study of plastics, 60 pcs. of each species
|
31730-00
|
1
|
|
Iris diaphragm
|
08045-00
|
1
|
|
Lens holder
|
08012-00
|
1
|
|
Support base variable
|
02001-00
|
1
|
|
Formic acid 98-100% 250 ml
|
30021-25
|
1
|
|
Sodium chloride, 500 g
|
30155-50
|
1
|
|
Acetone, chem.pure 250 ml
|
30004-25
|
1
|
|
Ring with boss head, i. d. = 10 cm
|
37701-01
|
1
|
|
Support rod, stainless steel, l = 600 mm, d = 10 mm
|
02037-00
|
3
|
|
Test tube rack for 12 tubes, holes d= 22 mm, wood
|
37686-10
|
1
|
|
Universal clamp
|
37715-00
|
1
|
|
Boss head
|
02043-00
|
2
|
|
Protecting glasses, clear glass
|
39316-00
|
1
|
|
Test tube, 18x188 mm, 10 pcs
|
37658-03
|
1
|
|
Glass beaker DURAN®, tall, 250 ml
|
36004-00
|
5
|
|
Spoon, special steel
|
33398-00
|
1
|
|
Wire gauze 160 mm x 160 mm, ceramic cen.
|
33287-01
|
1
|
|
Wash bottle, plastic, 500 ml
|
33931-00
|
1
|
|
Glass rod,boro 3.3,l=200mm, d=5mm
|
40485-03
|
1
|
|
Rubber stopper, d=22/17 mm, without hole
|
39255-00
|
2
|
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