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Entropy as spreading out

Entropy as spreading out

Particle diagrams of the same substance as a solid, liquid, and gas with entropy increasing from solid to gas

Entropy, symbol SSS, measures how spread out particles and energy are. For the same substance, solids have the lowest entropy, liquids are higher, and gases are highest because gas particles have far more possible arrangements.

Entropy Lesson

  1. A Level
  2. /Chemistry
  3. /Entropy

Step-by-step lessons on Edexcel A Level Chemistry Entropy. Each one builds up to exam-style questions. Build confidence with atomic structure, bonding and moles calculations early on, since these underpin the more demanding organic mechanisms, equilibrium and practical-analysis topics that dominate Year 2.

Lessons