🔍 Key Concepts

• Tons per inch immersion (TPI): relationship between weight added/removed and change in draft • Difference between moment to change trim 1 inch (MCT 1 in) and change in mean draft • How draft change is measured: per inch of immersion over the waterplane area

💭 Think About

• Ask yourself: Which term directly expresses "tons per inch" of change in draft, without involving trim or moments? • Which symbols contain the letter M because they are related to moments, not just simple weight change? • Among the choices, which one is widely used in basic loading problems to find new drafts when cargo is added or removed?

✅ Before You Answer

• Verify which option is defined as tons of weight required to change the mean draft by 1 inch • Check which options relate to moments to change trim, not simple changes in overall draft • Confirm the standard abbreviation used in ship stability formulas for tons per inch immersion