🔍 Key Concepts

• Viscosity and how it changes when most liquids are heated • How oil and water behave differently with temperature, especially density/specific gravity changes • Why oily-water separators rely on a difference in specific gravity between oil and water to work effectively

💭 Think About

• When you heat oil, does it usually flow more easily or more sluggishly? How does that relate to viscosity? • Think about density: as temperature increases, does a liquid usually become slightly more or less dense? How might this affect oil and water differently? • For separation, do you want a larger or smaller difference in specific gravity between oil and water? How would heating help or hurt this?

✅ Before You Answer

• Be clear on what viscosity means: higher viscosity = thicker, lower viscosity = thinner/easier flowing • Remember that both oil and water change density with temperature, but not in exactly the same way • Check each choice: does it correctly pair the typical viscosity change of heated oil with a realistic change in specific gravity differential between oil and water?