Question

Define calorific value.

Answer 1

Hint: Calorific value or calories are the energy acquired from the fuel or food and is measured by combustion of the specified quantity of the substance, whose value we want to measure. The SI unit of calorific value is joules per kilogram or J/kg.

Complete step by step answer:
In this question, we have been asked about the calorific value. As we have already mentioned, calorific value or calories are the energy acquired from the fuel or food.
Let's take an example to understand calorific values or calorific power in detail. We eat food and get energy from it. When we drink glucose, we feel more energetic than when we drink water because glucose provides more energy.
So, the amount of energy provided by glucose is its calorific value. So, we can say calorific value if glucose is more than water. We mentioned earlier that its value is measured by combustion of the specified quantity of the substance, whose value we want to measure.
Here, combustion means not burning but use of that energy released by the substance. We can now define calorific value as the amount of energy provided by 1g of the substance.
So, it can be measured by energy released per kg and its SI unit is joule per Kg or J/kg.

Note:
Calorific value is a very useful quantity, as it gives the knowledge of the calorific value of fuel that a human body uses for its activities. This helps us to determine the amount of energy we transport.