Question

How can we liquefy air?

Answer 1

Answer:

The liquefaction of air is used to obtain nitrogen, oxygen, and argon and other atmospheric noble gases by separating the air components by fractional distillation in a cryogenic air separation unit.

Answer 2

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ᴀɪʀ ɪs ғᴇᴅ ᴀᴛ ʜɪɢʜ ᴘʀᴇssᴜʀᴇ (>60 ᴘsɪɢ, ᴏʀ 520 ᴋᴘᴀ) ɪɴᴛᴏ ᴛʜᴇ ʟᴏᴡᴇʀ ᴄᴏʟᴜᴍɴ, ɪɴ ᴡʜɪᴄʜ ɪᴛ ɪs sᴇᴘᴀʀᴀᴛᴇᴅ ɪɴᴛᴏ ᴘᴜʀᴇ ɴɪᴛʀᴏɢᴇɴ ᴀɴᴅ ᴏxʏɢᴇɴ-ʀɪᴄʜ ʟɪǫᴜɪᴅ. ... ᴀɪʀ ᴄᴀɴ ᴀʟsᴏ ʙᴇ ʟɪǫᴜᴇғɪᴇᴅ ʙʏ ᴄʟᴀᴜᴅᴇ's ᴘʀᴏᴄᴇss, ᴡʜɪᴄʜ ᴄᴏᴍʙɪɴᴇs ᴄᴏᴏʟɪɴɢ ʙʏ ᴊᴏᴜʟᴇ–ᴛʜᴏᴍsᴏɴ ᴇғғᴇᴄᴛ, ɪsᴇɴᴛʀᴏᴘɪᴄ ᴇxᴘᴀɴsɪᴏɴ ᴀɴᴅ ʀᴇɢᴇɴᴇʀᴀᴛɪᴠᴇ ᴄᴏᴏʟɪɴɢ.✌✌