When considering materials like PVC, CPVC, and UPVC for transporting or storing oil, it's important to look at their chemical resistance and temperature tolerance. PVC (Polyvinyl Chloride) is commonly used for a wide range of applications due to its chemical resistance, but it is not ideal for hot applications as it can warp. CPVC (Chlorinated Polyvinyl Chloride) has similar chemical resistance to PVC but can withstand higher temperatures, making it better suited for hot fluids. UPVC (Unplasticized Polyvinyl Chloride), also known as rigid PVC, has high chemical resistance and is used for cold water systems but is not ideal for oil-related applications given its brittleness and potential to degrade when exposed to certain oils at varying temperatures. Considering these factors, CPVC stands out as a potentially better option for oil-related applications due to its balance of chemical resistance and ability to handle higher temperatures, though its compatibility with specific types of oil should be verified for each use case.

The yarn emoji is a representation of a ball of yarn, often used to denote knitting, crochet, crafts, or warmth. It's a part of the Unicode Standard, which means it can be used across different platforms (iOS, Android, Windows) and social media. The appearance might vary slightly depending on the platform due to design customizations. It can usually be found in the "activities" or "objects" section of your emoji keyboard. Its addition to the emoji library came with the aim of representing hobbies and activities more comprehensively, catering to a wider range of users' interests and promoting expressions related to handcraft and creativity. If you're having trouble finding it, make sure your device's software is up-to-date, as newer emojis are often included in software updates.

To prevent emulsion during extraction, careful technique and appropriate conditions are key. Firstly, choose solvents with significantly different densities to aid separation. Adding salt (salting out) can enhance the solvent's polarity difference, making emulsions less likely. Gently mixing rather than vigorous shaking reduces the chance of creating an emulsion. If an emulsion forms, it can sometimes be resolved by centrifugation to force separation or by adding a solvent in which the emulsion droplets are soluble. Using a droplet coalescer or increasing the temperature carefully to decrease the viscosity can also help. Finally, patience is crucial; allow ample time for phases to separate naturally.