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.
Entropy is a measure of disorder. According to the second law of thermodynamics, the entropy of a closed system can never decrease. It can be used to explore aspects of phenomena from fluorescence to cosmology, and properties of black holes.
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