sponge though compressible is a solid
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The sponge is compressible being a solid because of the presence of air cavities inside it. The sponge has numerous pores in it which can be referred to as air cavities, in which air is trapped and on compressing it comes out of the sponge. These pores are the reason why sponge can easily soak liquid into it.
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A sponge has minute holes in it which are filled with air. So when compressed, the air inside it is expelled and we can compress it. It is still a solid, though.
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