Sorry for this vague question but I'd just like to ask a question that my teachers weren't able to give a really satisfactory answer to.
In my notes the specific heat capacity is defined with the statement: "the numerical value of the specific heat capacity of a substance is the quantity of heat required to raise the temperature of unit mass of the substance by one degree.". However, I am unsure why the "numerical value" is emphasised so much. The definitions that I've seen for specific heat capacity up to this point all only mention the part about how it is "the quantity of heat required to raise the temperature of unit mass of the substance by one degree", leaving it out entirely.
Is this extra clarification necessary? Is it part of some more formal definition of the specific heat capacity?