The terms in bold link to topics in the AQA, Edexcel, OCR, WJEC and CCEA A-level specifications, as well as the IB, Pre-U and SQA exam specifications.
Vapour trails form when water vapour condenses to form droplets and then freezes to create ice crystals, which may sublime to return directly to vapour. A combination of atmospheric pressure, temperature and relative humidity determines whether these processes occur.
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