The particle model of matter
The particle model of matter

Matter is anything that has mass and takes up space. A particle is a tiny piece of matter, and in the particle model the arrangement and motion of particles explain the properties of solids, liquids, and gases.
Step-by-step lessons on OCR GCSE Physics The particle model. Each one builds up to exam-style questions. Paper 2 and Paper 4 include synoptic questions that draw on Topics P1–P4, so revisit earlier topics before final exams rather than treating each paper as self-contained.