🔍 Key Concepts

• Ethylene glycol concentration vs. freezing point – how the freezing temperature changes as the percentage increases • Ethylene glycol concentration vs. boiling point – how the dashed boiling-point curve rises with concentration • The chart’s recommended concentration range (30–67%) and where the lowest freezing temperature actually occurs

💭 Think About

• For each choice, find the stated concentration on the horizontal axis and then read both the freezing and boiling curves at that point – do they match the temperatures given? • Look carefully at the point of greatest freeze protection on the solid curve – is it at 100% glycol, or somewhere else? • When the freezing protection is about -60°F, what concentration range on the bottom scale does that correspond to, and what boiling range does the dashed line show there?

✅ Before You Answer

• For each option, locate the exact concentration (or freeze protection) on the graph before judging it • Confirm whether 100% glycol actually gives the lowest (coldest) freezing point on the solid curve • Verify that the boiling-point temperature range claimed in any option matches the dashed curve at the corresponding concentration or freeze-protection point