Which statement best explains the difference between sensible heat and latent heat?

Which statement best explains the difference between sensible heat and latent heat?

• A. Sensible heat is measurable with a thermometer; latent heat involves phase change without a temperature change.
• B. Latent heat is measurable with a thermometer; sensible heat involves phase change.
• C. Sensible heat can only occur in gases; latent heat only in solids.
• D. Latent heat is always larger than sensible heat in any process.

Answer: (A)

The key idea is that sensible heat changes temperature, while latent heat is the energy involved in changing the substance’s phase without a temperature change. When you add sensible heat to a material, its molecules’ kinetic energy increases and the temperature rises. During a phase change, like melting or boiling, energy goes into breaking or forming intermolecular bonds rather than increasing temperature, so the temperature stays the same until the change is complete. That’s why sensible heat is what a thermometer reads, and latent heat is the energy absorbed or released during the phase change without a temperature change. A classic example is heating ice: the temperature rises as sensible heat until 0°C, then melting requires latent heat with a constant temperature, and only after all ice has melted does further heat increase the temperature of the liquid. The other statements don’t fit because latent heat is not measured by a thermometer during a phase change, sensible heat isn’t about phase change, latent heat isn’t restricted to solids or gases, and its magnitude isn’t universally larger than sensible heat.

The key idea is that sensible heat changes temperature, while latent heat is the energy involved in changing the substance’s phase without a temperature change. When you add sensible heat to a material, its molecules’ kinetic energy increases and the temperature rises. During a phase change, like melting or boiling, energy goes into breaking or forming intermolecular bonds rather than increasing temperature, so the temperature stays the same until the change is complete. That’s why sensible heat is what a thermometer reads, and latent heat is the energy absorbed or released during the phase change without a temperature change. A classic example is heating ice: the temperature rises as sensible heat until 0°C, then melting requires latent heat with a constant temperature, and only after all ice has melted does further heat increase the temperature of the liquid. The other statements don’t fit because latent heat is not measured by a thermometer during a phase change, sensible heat isn’t about phase change, latent heat isn’t restricted to solids or gases, and its magnitude isn’t universally larger than sensible heat.