Question

which apparatus is used to convert gas into liquid by cooling it
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Answer 1

Explanation:

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⟹9p - {{3p - [4p - 5p + 2p)}}]⟹9p−3p−[4p−5p+2p)]

⟹9p - [3p - 4p + 5p - 2p]⟹9p−[3p−4p+5p−2p]

⟹9p - [ - p + 3p]⟹9p−[−p+3p]

⟹9p - 2p = 7p⟹9p−2p=7p

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