why is mercury used in making thermometers?
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ᴍᴇʀᴄᴜʀy ɪꜱ ᴛʜᴇ ᴏɴʟy ᴏɴᴇ ɪɴ ʟɪqᴜɪᴅ ꜱᴛᴀᴛᴇ ᴀᴛ ʀᴏᴏᴍ ᴛᴇᴍᴩᴇʀᴀᴛᴜʀᴇ. ɪᴛ'ꜱ ᴜꜱᴇᴅ ɪɴ ᴛʜᴇʀᴍᴏᴍᴇᴛᴇʀꜱ ʙᴇᴄᴀᴜꜱᴇ ɪᴛ ʜᴀꜱ ʜɪɢʜ ᴄᴏᴇꜰꜰɪᴄɪᴇɴᴛ ᴏꜰ ᴇxᴩᴀɴꜱɪᴏɴ. ʜᴇɴᴄᴇ, ᴛʜᴇ ꜱʟɪɢʜᴛᴇꜱᴛ ᴄʜᴀɴɢᴇ ɪɴ ᴛᴇᴍᴩᴇʀᴀᴛᴜʀᴇ ɪꜱ ɴᴏᴛᴀʙʟᴇ ᴡʜᴇɴ ɪᴛ'ꜱ ᴜꜱᴇᴅ ɪɴ ᴀ ᴛʜᴇʀᴍᴏᴍᴇᴛᴇʀ. ɪᴛ ᴀʟꜱᴏ ʜᴀꜱ ᴀ ʜɪɢʜ ʙᴏɪʟɪɴɢ ᴩᴏɪɴᴛ ᴡʜɪᴄʜ ᴍᴀᴋᴇꜱ ɪᴛ ᴠᴇʀy ꜱᴜɪᴛᴀʙʟᴇ ᴛᴏ ᴍᴇᴀꜱᴜʀᴇ ʜɪɢʜᴇʀ ᴛᴇᴍᴩᴇʀᴀᴛᴜʀᴇꜱ.
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Mercury is the only one in liquid state at room temperature. It's used in thermometer because it has high coefficient of expansion. Hence, the slightest change in temperature is notable when it's used in a thermometer. It also has a high boiling point which makes it very suitable to measure high temperature.
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