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9702 · 15.2

Equation of state

Imagine trying to predict how a balloon behaves when you heat it up or squeeze it. Physics gives us powerful tools, like the **equation of state**, to do just that. This lesson dives into the theoretical model of an **ideal gas** and the fundamental laws that govern its **pressure**, **volume**, and **temperature**. This pilot aligns with **Senpai Corner** A Level notes (2025–2027) for topic **15.2**.

Need to know

What you need to know

  • The gas consists of a large number of identical molecules in continuous, random motion.
  • The volume of the molecules themselves is negligible compared to the volume of the container they occupy.
  • There are no intermolecular forces of attraction or repulsion between molecules; their potential energy is zero.
  • All collisions between molecules and with the walls of the container are perfectly elastic (no kinetic energy is lost).
  • The duration of a collision is negligible compared to the time between collisions.

Explanation

Equation of state

  1. The gas consists of a large number of identical molecules in continuous, random motion.
  2. The volume of the molecules themselves is negligible compared to the volume of the container they occupy.
  3. There are no intermolecular forces of attraction or repulsion between molecules; their potential energy is zero.
  4. All collisions between molecules and with the walls of the container are perfectly elastic (no kinetic energy is lost).
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