Properties of the state of a gas


Effect of changes in pressure, volume and temperature on other gas parameters

Virtual experiment 

In this virtual simulation, you can see the properties of gas particles: volume change, particle motion due to heat. This experiment is a continuation of the gas particle motion simulation, further revealing the properties of a gas.

The figure below shows the functions that each button performs.


Step 1. When you enter the virtual experiment “properties of gas particles”, you have four different sections: ideal, exploration, energy, and diffusion. In this activity, you will choose the ideal section and conduct experiments in that section.

Step 2. Display the ruler by specifying its width in the “Width” box (found in the parameter box). You can see that the initial width of the box is 10 nanometers.

Step 3. Using the “add particles” tool, add the required number of particles to the box. The number of available particles is displayed in the “particles” section. You can monitor the temperature and pressure changes inside the box in the corresponding indicators.

Step 4. Change the value of the “Constant” parameter from “nothing” to “Volume”. In this mode, the volume of the box will be fixed.

Step 5. As you heat or cool the box, observe the changes in temperature and pressure.

Step 6. Change the value of the “Constant” parameter to “Temperature”. The temperature will now be fixed and the other parameters will change as it changes.

Step 7. Try resizing the box by increasing or decreasing its width. You will notice that when you compress, the volume decreases and the pressure increases, and vice versa, when you expand, the volume increases and the pressure decreases.

Step 8. Change the value of the Constant parameter to Pressure.

Step 9. By heating or cooling the box, observe the changes in temperature and volume.

Step 10. Change the value of “Constant” parameter to the next type of “Pressure”. And in this mode, the pressures will be fixed.

Step 11. Observe how the temperature and volume will change proportionally when the volume of the box changes (expansion or contraction).

Step 12. If you wish, you can continue the experiment using other parameters available in the simulation.

Step 13. As you change the parameters, observe the changes that occur in the box and with the parts and draw conclusions about the relationship between pressure, volume, and temperature.


The virtual experiment demonstrated the changes that occur to gas particles when pressure, volume, and temperature are changed.