Compression of sponge is which kind of change ?
Chemical change or physical change
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The process merely change the physical condition of the gas. Therefore, compression is not a chemical process. It is a physical process.
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In which category of matter does sponge exist?
The sponge is compressible because it is having minute pores in which air is trapped . on pressing the air is expelled. The sponge is matter and considered as solid because it has a definite volume and shape does not change unless compressed. A sponge can be compressed easily even though it can be considered as solids because they have minute pores in it which are filled with air.
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