I have noticed this while bathing when soap foam went into my ears and it almost completely blocked the outside sound. This seems weird as soap foam is just all air with some liquid
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it’s like this….
you have a brick resting on your hand. you slap the brick, it hurts your hand, right?
now, you ahve a bag of beans, or rice, or whatever that is small but fills a bag. You slap the bag, you feel the impact but it doesn’t really hurt.
now, you have a balloon, or an inflated bag/pillow/sack of some sort, resting on your hand. you slap it, and you still feel the impact, but not to the same degree and doesn’t hurt at all.
what you just did was demostrating the properties to transmit energy of the thre matter states. Solid, liquid(particle in this demo), and air (plasma excluded). you can observe that the solid transmits it the best, and the air the least.
Sound is a form of energy, energy is transmitted through air the least efficient (balloon scenario).
So, having bubbles in your ears is placing an air barrier in your ears. You should also experiance the same with putting [sound proof headphones](https://www.amazon.com/Soundproof-Protection-Headphones-Adjustable-Prevention/dp/B07PZKM13L) on your head, which creates an air pocket/barrier over yoru ears. it should perform similiar to bubbles.
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