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5. Uitlaatstelsels van motors kan nie beskerm word deur dit te verf nie.
Hoekom nie?
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6. Hoekom roes vlekvrye staal stadiger as gewone staal?
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4. MATERIALE KAN WARMTE OORDRA
As jy ‘n koue teelepel vir ‘n tydjie in kookwater hou, word dit warm wanneer jy daaraan raak. Warmte is dus oorgedra van die water na die teelepel. (Hierdie oordrag van warmte sal net plaasvind totdat die temperatuur van beide stowwe dieselfde is).
Oordrag van warmte vind op drie maniere plaas, nl. geleiding, stroming, straling:
4.1 Geleiding :
Dit is die oordrag van warmte van een deel van ‘n stof na ‘n ander, terwyl elke deel op sy eie plek bly.
Interessante gebruike van swak geleiers:
Noem nog VYF voorbeelde, elk met ‘n kort verduideliking:
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