This resource appears to be designed to build towards this crosscutting concept, though the resource developer has not explicitly stated so.
Comments about Including the Crosscutting Concept
The ideal gas model is based on an assumption that gas particles do not interact. This assumption can be used to accurately predict the behavior of a helium filled balloon at low temperatures as there is minimal interaction between helium atoms. However, the intermolecular forces between molecules in air are strong at low temperatures, meaning the molecules move much closer together than can be predicted by the Charles’s Law for an ideal gas. The information provided in the instructional materials from the blog explain this in greater detail, but there is no suggestion for how to make this connection more explicit for students. Teachers will need to structure discussion opportunities to allow for the connection of the demonstration to a deeper exploration of the differences in ideal and real gases.