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Cork insulation; a complete illustrated textbook on cork insulation ...

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STRUCTURAL SUGGESTIONS 233<br />

in water (foam), etc, "The colloidal realm ranges from the<br />

lower limit of microscopic visibility to the upper limit of mo-<br />

lecular dimensi<strong>on</strong>s," says Holmes, and adds that most colloidal<br />

particles are aggregates of hundreds or even thousands of<br />

molecules.<br />

Water, wood, paper, clothing, glass, cement, paints, inks,<br />

asphalt, cheese, oils, and countless other materials in comm<strong>on</strong><br />

FIG. 81.—INSULATED ICE STORAGE HOUSE WITH PLASTIC MASTIC<br />

FINISH APPLIED OVER CORKBOARD AT POINT OF ERECTION.<br />

are colloidal, that is, may be dispersed in or surrounded by<br />

' some other substance.<br />

A small quantity of oil may, for example, be dispersed in<br />

'Water, by vigorous shaking or stirring; but to maintain the<br />

or keep the emulsi<strong>on</strong>, is the problem. Aside from<br />

I dispersi<strong>on</strong>,<br />

tl the<br />

' being<br />

unequal specific gravities of the two substances, the fact<br />

of the unequal surface tensi<strong>on</strong>s of water and oil assists in<br />

causing the microscopic drops of oil to form together, separat-<br />

ing from the water, the surface tensi<strong>on</strong> of any given liquid<br />

that tensi<strong>on</strong> by virtue of which it acts as an elastic

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