Not all polymers are non-Newtonian fluids. Polymers can exhibit a variety of rheological behaviors depending on their molecular structure and the conditions to which they are subjected. Non-Newtonian fluids, unlike Newtonian fluids, have a viscosity that changes with the rate of shear (how fast they are deformed or stirred). Many polymers in solution or melted form do exhibit non-Newtonian behavior due to their long, chain-like molecular structure, which can become entangled or aligned under flow, affecting their viscosity. Examples include polymer melts and solutions, which often behave as shear-thinning fluids. However, some polymer solutions can exhibit near-Newtonian behavior under certain conditions, especially at low concentrations or with polymers of simple structure. Thus, while many polymers are non-Newtonian, it's not accurate to categorize all polymers as such.

Oxygen and acetylene burn together in a controlled environment to produce a highly intense flame, widely used in welding and cutting applications. When oxygen is combined with acetylene, it produces a flame with temperatures that can reach approximately 3,500 degrees Celsius (6,332 degrees Fahrenheit). This high temperature enables the flame to cut through metals by rapidly oxidizing them. It's essential to handle these gases with care and follow safety protocols strictly due to the high combustion temperature and potential hazards associated with their use.

[The vibrant emerald green color observed in emeralds is primarily due to the presence of chromium (and sometimes vanadium) impurities within the beryl mineral (Be₃Al₂Si₆O₁₈). The electron transitions within the d orbitals of these metal ions are indeed responsible for the absorption of specific wavelengths of light, which in turn dictates the color we perceive. When light interacts with an emerald, certain wavelengths are absorbed by the electron transitions in the chromium's d orbitals. The wavelengths that are not absorbed are reflected, and the predominant reflection is in the green region of the spectrum, thus giving emeralds their characteristic green color. This phenomenon, related to the electronic structure of the impurity atoms and their interaction with light, is a beautiful example of how quantum mechanics plays a role in the natural world, specifically in the realm of coloration in gemstones.]