OCR GCSE Chemistry B · J258
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
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GCSE Chemistry · key term
A fraction made from two equivalent measurements, such as . Its value is one, so multiplying by it changes the unit but not the physical quantity.
Used by OCR
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Arrange each conversion factor so that the unwanted unit cancels. If it does not cancel, invert the factor.
With a unit after “per”, such as the seconds in metres per second, remember that it is in the denominator; its conversion factor therefore has the opposite numerical effect.
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