the amount of heat gained or lost by a substance is equal to the product of its heat capacity times the change in temperaturetimes its _____________

This sounds like it would be body size or mass.

I hope this helps. Thanks for asking.

In order to complete the sentence, we need to understand the formula for calculating the amount of heat gained or lost by a substance. This calculation can be done using the formula:

Q = mcΔT

Where:
- Q represents the amount of heat gained or lost
- m is the mass of the substance
- c is the specific heat capacity of the substance
- ΔT is the change in temperature of the substance

Given that the formula includes the term "mcΔT," the blank space in the sentence should be filled with "mass." Therefore, the amount of heat gained or lost by a substance is equal to the product of its heat capacity times the change in temperature times its mass.