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→Key Stage 4
==Key Stage 4==
===Meaning===
'''Calibrating''' is when a [[scientist]] checks an [[Scientific Measuring Instrument|instrument]] against a known value to see that it [[Reading|reads]] the correct value.
===About Calibration===
: '''Calibration''' is used to correct for a [[Zero Error|zero error]] in which an [[Scientific Measuring Instrument|instrument]] [[reading|read]]s the wrong number.
===Examples===
: To check a [[thermometer]] is [[calibrate]]d a [[scientist]] could place it in [[boiling]] [[water]] to check that it [[reading|reads]] 100°C and in [[freezing]] [[water]] to check that it [[reading|reads]] 0°C.
: To check an [[Analogue Ammeter|analogue ammeter]] is [[calibrate]]d the dial can be [[reading|read]] before a [[Electrical Current|current]] is passed through it to see that it says zero.