Железные частицы в масле реагируют на магнит
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![Аэрогель — самый легкий твердый материал [Veritasium]](https://sun9-47.userapi.com/meRgVJEgG3EB6bpa8sOVIHrZ5GMx2-v16Ki7rw/DD_EC8R9D80.jpg)
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