🔍 Key Concepts

• Low expansion mechanical foam and its typical expansion ratio • Difference between foam concentrate (liquid) and finished foam volume • How low, medium, and high expansion foams compare in terms of volume increase

💭 Think About

• First, recall the normal expansion range for low expansion foam (about how many times the liquid volume it becomes). • Compare that typical range with each answer choice: which values clearly look too small or unrealistically large for low expansion foam? • Think about practical firefighting: would a system be designed to increase foam volume only a little, or by an extremely huge factor, for "low expansion" foam?

✅ Before You Answer

• Make sure you are focusing on low expansion foam, not medium or high expansion values. • Eliminate options that would fit better with high expansion foam (extremely large multiples of the original volume). • Verify which choice best matches the commonly taught expansion ratio for low expansion mechanical foam in basic marine firefighting references.