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Structure 1.4.6—Avogadro’s law states that equal volumes of all gases measured under the same conditions of temperature and pressure contain equal numbers of molecules.


Here are experiments our science specialists have selected to support this IB* topic.

Avogadro’s Law and Order: Investigating a Rocket Launch Failure

Experiment #5 from Forensic Chemistry Experiments

  • Use a scale model to investigate the changes in gas pressure as fixed volumes of gas are added.
  • Analyze data to develop a mathematical model that can predict the volume of gas needed to reach the pressure limit of a 2 L bottle.
  • Use mathematical representations to compare the rates of change in pressure for air and carbon dioxide as fixed volumes of gas are added.
  • Communicate scientific and technical information and ideas about how to determine the cause of the 2 L bottle explosion.

Educational Standard
International Baccalaureate (IB) 2025
Organizing concepts
Structure 1. Models of the particulate nature of matter
Structure 1.4—Counting particles by mass: The mole
Standard level and higher level

* The IB Diploma Program is an official program of the International Baccalaureate Organization (IBO) which authorizes schools to offer it. The material available here has been developed independently of the IBO and is not endorsed by it.