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When raindrops fall on a red-brick wall after dry and hot weather, hissing sounds are produced. Explain the phenomenon.
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Raindrops falling on the brick at first form a film or, it's surface (Fig.). The brick has a porous structure, and the pores behave like capillaries. Due to surface tension, water is sucked into pores-capillaries. The capillaries are interconnected and have various sizes, the number of narrow capillaries being larger. The force of surface tension sucking water in wide capillaries is weaker than the force acting in narrow capillaries. For this reason, the water film in wide capillaries will bulge and break. This phenomenon is responsible for the hissing sounds.
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| Question Text | When raindrops fall on a red-brick wall after dry and hot weather, hissing sounds are produced. Explain the phenomenon. |
| Answer Type | Text solution:1 |
| Upvotes | 150 |
