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Sound is a series of vibrations interpreted by your brain. These vibrations travel more easily through solids than liquids or gases as the molecules are closer together and can therefore make their neighbours vibrate more easily. This is why you can hear what is on the other side of a wall better if you put your ear against it.

As the vibrations travel through a medium they may come to other substances, and energy is expended when they reach another substance. This expenditure of energy (because vibrations are just kinetic energy) means less is passed into the next substance, so less sound passes into each new substance. This is why a wall blocks sound rather than making it easier to hear through. In a wall with air holes, the sound vibrations have to pass into a different substance many times; wall, air, wall, air, wall, etc. Therefore, a lot more energy is expended in the vibrations passing through the wall than would have been expended were it a solid wall, and so less sound comes through that wall.

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Q: How are brick walls with air holes in them more soundproof than solid walls?
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