The definition of sensible heat is ______.

Sensible heat refers to the heat exchanged by a substance that results in a temperature change of that substance, which can be detected and measured using a thermometer. It is the type of heat that you can "feel" and observe as a rise or fall in temperature without a change in phase or state of the material, such as from solid to liquid or liquid to gas. This is why option B accurately defines sensible heat, as it directly relates to measurable temperature changes.

The other options refer to concepts that do not align with the specific definition of sensible heat. The option mentioning heat that causes a change of state describes latent heat, while the one about heat during a chemical reaction pertains to the energy changes associated with chemical processes. Finally, the total internal energy encompasses all forms of energy present in a substance, not just the measurable heat aspect. Hence, B is the accurate description of sensible heat.