Key term for OCR GCSE Chemistry B, used in Evidence and causes of climate change.
A unit of concentration showing how many parts of a specific substance are present in one billion parts of a total mixture.
Parts per billion (ppb) appears in OCR GCSE Chemistry B revision content for Air and water, especially Evidence and causes of climate change and Orders of magnitude.
Create a free account to access OCR GCSE Chemistry B revision notes, track progress, and practise related key terms.
