🔍 Key Concepts

• Brake specific fuel consumption (BSFC) is a measure of how much fuel an engine uses to produce a given amount of power over time • The word specific in engineering usually means "per unit of" something (mass, power, time, etc.) • Think about the difference between fuel energy content, engine power, and fuel rate

💭 Think About

• Ask yourself: BSFC compares fuel used to what engine output? Is it just fuel per hour, or fuel related to power produced? • Look at each choice and decide: which one is a rate of fuel use per unit power per unit time? • Which options are just properties of the fuel or formulas, and which option actually shows a relationship between fuel consumed, power produced, and time?

✅ Before You Answer

• Identify which choice has units that include mass of fuel, power output, and time together • Eliminate any option that describes only fuel energy content (heat value) or a formula name instead of units • Verify that the remaining unit can reasonably be read as "pounds of fuel required to produce one brake horsepower for one hour"