In: Chemistry
Sort the following materials by those that show capillary rise and those that do not.
wick of a burning candle raincoat exposed to rain fabric of plastic umbrella in rain tea spilled on glass slab bristles of a paint brush in water sponge pads used for cleaning vessels milk in plastic container |
1) Materials that show Capillary Rise are:
sponge pads used for cleaning vessels
bristles of a paint brush in water
wick of a burning candle
2) Materials that do not show Capillary Rise are:
raincoat exposed to rain
fabric of plastic umbrella in rain
tea spilled on glass slab
milk in plastic container
Reason: Capillary action is the momentum of H2O (or any liquid) through a narrow diameter tube. This force is determined by the molecular attraction between water and the absorbing substance. Adhesion is the attractive force between the liquid and other objects, which tends to move the water along the capillary. wick, sponge & bristles have narro diameter substances hence they will show capillary action. Plastic container, glass slab, fabric of plastic and rain coat (water repellant material) are broader diameter materials, they do not show this property.
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