mercury is commonly used thermometric liquid because
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ᴍᴇʀᴄᴜʀʏ ɪꜱ ᴛʜᴇ ᴏɴʟʏ ᴏɴᴇ ɪɴ ʟɪQᴜɪᴅ ꜱᴛᴀᴛᴇ ᴀᴛ ʀᴏᴏᴍ ᴛᴇᴍᴘᴇʀᴀᴛᴜʀᴇ. ɪᴛ'ꜱ ᴜꜱᴇᴅ ɪɴ ᴛʜᴇʀᴍᴏᴍᴇᴛᴇʀꜱ ʙᴇᴄᴀᴜꜱᴇ ɪᴛ ʜᴀꜱ ʜɪɢʜ ᴄᴏᴇꜰꜰɪᴄɪᴇɴᴛ ᴏꜰ ᴇxᴘᴀɴꜱɪᴏɴ. ʜᴇɴᴄᴇ, ᴛʜᴇ ꜱʟɪɢʜᴛᴇꜱᴛ ᴄʜᴀɴɢᴇ ɪɴ ᴛᴇᴍᴘᴇʀᴀᴛᴜʀᴇ ɪꜱ ɴᴏᴛᴀʙʟᴇ ᴡʜᴇɴ ɪᴛ'ꜱ ᴜꜱᴇᴅ ɪɴ ᴀ ᴛʜᴇʀᴍᴏᴍᴇᴛᴇʀ.
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Mercury is the only one in liquid state at room temperature. It's used in thermometers because it has high coefficient of expansion. Hence, the slightest change in temperature is notable when it's used in a thermometer.
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