Question

A precise measurement is one which has

Answer 1

ɪɴ ᴛʜɪꜱ ᴄᴀꜱᴇ, ʏᴏᴜʀ ᴍᴇᴀꜱᴜʀᴇᴍᴇɴᴛ ɪꜱ ɴᴏᴛ ᴄʟᴏꜱᴇ ᴛᴏ ᴛʜᴇ ᴋɴᴏᴡɴ ᴠᴀʟᴜᴇ. ᴘʀᴇᴄɪꜱɪᴏɴ ʀᴇꜰᴇʀꜱ ᴛᴏ ᴛʜᴇ ᴄʟᴏꜱᴇɴᴇꜱꜱ ᴏꜰ ᴛᴡᴏ ᴏʀ ᴍᴏʀᴇ ᴍᴇᴀꜱᴜʀᴇᴍᴇɴᴛꜱ ᴛᴏ ᴇᴀᴄʜ ᴏᴛʜᴇʀ. ᴜꜱɪɴɢ ᴛʜᴇ ᴇxᴀᴍᴘʟᴇ ᴀʙᴏᴠᴇ, ɪꜰ ʏᴏᴜ ᴡᴇɪɢʜ ᴀ ɢɪᴠᴇɴ ꜱᴜʙꜱᴛᴀɴᴄᴇ ꜰɪᴠᴇ ᴛɪᴍᴇꜱ, ᴀɴᴅ ɢᴇᴛ 3.2 ᴋɢ ᴇᴀᴄʜ ᴛɪᴍᴇ, ᴛʜᴇɴ ʏᴏᴜʀ ᴍᴇᴀꜱᴜʀᴇᴍᴇɴᴛ ɪꜱ ᴠᴇʀʏ ᴘʀᴇᴄɪꜱᴇ. ᴘʀᴇᴄɪꜱɪᴏɴ ɪꜱ ɪɴᴅᴇᴘᴇɴᴅᴇɴᴛ ᴏꜰ ᴀᴄᴄᴜʀᴀᴄʏ.

Answer 2

Answer:

In this case, your measurement is not close to the known value. Precision refers to the closeness of two or more measurements to each other. Using the example above, if you weigh a given substance five times, and get 3.2 kg each time, then your measurement is very precise. Precision is independent of accuracy.