On which phenomenon thermos flask works?
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ᴀ ɢʀᴇᴀᴛ ᴇxᴀᴍᴘʟᴇ ᴏғ ᴄᴏɴᴛʀᴏʟʟɪɴɢ ʜᴇᴀᴛ ᴛʀᴀɴsғᴇʀ ɪs ᴀ ᴛʜᴇʀᴍᴏs (ᴏʀ ᴀ ʙᴇᴠᴇʀᴀɢᴇ ʙᴏᴛᴛʟᴇ). ᴛʜᴇ ᴛʜᴇʀᴍᴏs ʜᴇʟᴘs ʀᴇɢᴜʟᴀᴛᴇ ᴛʜᴇ ᴛᴇᴍᴘᴇʀᴀᴛᴜʀᴇ ᴏғ ᴛʜᴇ ʟɪϙᴜɪᴅ ɪɴsɪᴅᴇ ᴏғ ɪᴛ ʙᴇᴄᴀᴜsᴇ ɪᴛ ᴍɪɴɪᴍɪᴢᴇs ʜᴇᴀᴛ ᴛʀᴀɴsғᴇʀ ʙᴇᴛᴡᴇᴇɴ ᴛʜᴇ ʟɪϙᴜɪᴅ ᴀɴᴅ ɪᴛs sᴜʀʀᴏᴜɴᴅɪɴɢs.
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