https://phet.colorado.edu/en/simulations/states-of-matter

Now with the gas state of water selected, observe what happens to the water molecules when you continuously remove heat to the system. 1. How does the states of matter change as heat is removed continuously from the system? Now select the Phase Change tab at the top of the simulation. 1. Determine the pressure and temperature of the triple point for water using the addition of heat and removal of heat (cool) and watching the red dot move to the triple point on the Pressure vs. Temperature diagram. 2. Determine the pressure and temperature of the critical point for water by using the addition of heat and removal of heat (cool) and watching the red dot move to the critical point on the Pressure vs. Temperature diagram