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Structure 1.5.4—The relationship between the pressure, volume, temperature and amount of an ideal gas is shown in the ideal gas equation PV = nRT and the combined gas law P1V1/T1=P2V2/T2


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

Exploring the Properties of Gases

Experiment #30 from Advanced Chemistry with Vernier

In this experiment, you will

  • Conduct a set of experiments, each of which illustrates a gas law.
  • Gather data to identify the gas law described by each activity.
  • Complete the calculations necessary to evaluate the gas law in each activity.
  • From your results, derive a single mathematical relationship that relates pressure, volume, temperature, and number of molecules.

Cold Case for Carbon Dioxide

Experiment #8 from Forensic Chemistry Experiments

  • Measure the rate of diffusion of CO2 gas in a model of the cabin.
  • From the room dimensions, calculate the mass of CO2 needed to fill the room with 40,000 ppm CO2 gas.
  • Determine how long it would take to fill the cabin with CO2 using your rate data.

Educational Standard
International Baccalaureate (IB) 2025
Organizing concepts
Structure 1. Models of the particulate nature of matter
Structure 1.5—Ideal gases
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.