Why helium used to fill in balloon insted of hydrogen?
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Helium because helium is lighter than Hydrogen and air. And it is used in balloons to make them stay up in the air.
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ʏᴏᴜʀ ᴀɴsᴡᴇʀ ɪs ᴛʜᴇ ᴀᴛᴛᴀᴄʜᴍᴇɴᴛ
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