🔍 Key Concepts

• Difference between rate of flow and total (accumulated) flow • Understanding units: which ones include time and which do not • How flowmeters display instantaneous rate vs totalized quantity

💭 Think About

• Look at each choice and ask: does this unit tell me how much is moving per unit time, or the total amount that has passed? • Think about what a totalizer on a flowmeter would show after an hour of pumping—which unit best describes that reading? • For each option that includes time, decide whether that represents an ongoing rate or a final accumulated quantity.

✅ Before You Answer

• Identify which options use volume only vs volume (or mass) per time • Ask: would this unit be used to size a tank capacity (total) or a pump output rating (rate)? • Eliminate all units that clearly describe a flow rate, not an accumulated total quantity.