Materials for rain-proof coats and tents owe their water proof properties to________?
Correct answer: A. Surface tension
- A. Surface tension
- B. Viscosity
- C. Specific gravity
- D. Elasticity
Explanation
Surface tension makes water form droplets and resist spreading across the fibres of a treated coat or tent. Viscosity and specific gravity describe fluid behaviour and density, not waterproofing.
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