The discussion revolves around creating a visual 'heat wave' effect using different liquid combinations, focusing on the challenges of achieving this without mixing the substances. Participants explore various materials and methods, including glycerin, hydrocarbons, and salt solutions, while considering the implications of refractive index and solubility.
Participants generally do not agree on a single effective solution for achieving the heat wave effect without mixing. Multiple competing views and approaches remain, with ongoing exploration of various substances and methods.
Participants noted limitations related to the miscibility of substances, the need for specific conditions to maintain phase separation, and the safety concerns associated with certain chemicals. The discussion reflects a variety of experimental approaches and the challenges inherent in achieving the desired visual effect.
Nemus said:I have noticedthat somewhat surprisinlgly you can see these refractive index whorls in concentrated solutions of polyethyleneglycol solutions. Even old ones in sealed flasks that should be homogenous. My theory is that the selective accumulation of water vapor in the headspace is enough to cause some swirls. High Mw polyethyleneglycol can be bought as a laxative under various brand names. I think the generic name is macrogol.
Liquids that are imiscilble will not give the effect. However, you can get something like it if you match the density of two imiscible liquids. Water + dichloromethane (or even more toxic chloroform) + heptane (less toxic than hexane) would work. Silicone oil + a strong salt solution (sodium chloride may not be soluble enough so CaCl2 may have to be used)may also be an alternative but then I am only guessing.