🔍 Key Concepts

• Sensible heat vs latent heat – what is the difference between them? • How engineers describe the total energy content of a substance relative to a reference temperature. • Common HVAC/marine refrigeration term for the sum of sensible and latent heat.

💭 Think About

• Ask yourself: when you add up all the heat that changes temperature (sensible) and all the heat that changes state (latent), what are you really measuring? • Think about which choice is a general term for the total heat energy in a substance, not a special condition like being above saturation temperature. • Eliminate any option that only describes heat needed to raise 1 unit of mass by 1 degree, or heat above saturation point.

✅ Before You Answer

• Verify which term is used in marine engineering and refrigeration texts for the combined sensible + latent heat content. • Check that the option you pick does not refer only to temperature change at a constant phase (that would be something else). • Make sure the term you choose is about a sum of energies, not just an extra or leftover amount of heat.