Question

The amount of heat required to raise the temperature of ${\text{1 kilogram}}$ of water by ${1^\circ }C$ is called-
(A)$Kilo - calorie$
(B) ${\text{Calorie}}$
(C) ${\text{B}}{\text{.T}}{\text{.U}}$
(D) ${\text{Calorie}}{{\text{/}}^\circ }{\text{C}}$

Answer 1

Here as according to question i kilo-calories is equal to the one thousand calories as given in equation $1kilo - calories = 1000 calories$ and 1 kilo-calories is also equal to the 3.968 Btu as same here in the given equation $1kilo - calorie = 3.968318 Btu$ . where BTU is british thermal unit.

Complete step by step answer:
Kilo-calorie or kilogram calorie is the amount of heat that is required to raise the temperature of ${\text{1 kilogram}}$ of water by ${1^\circ }C$.

So, the correct answer is “Option A”.

Additional Information:
As the heat is added or given to a substance which is in solid state then the molecules of that particular substance gain kinetic energy and temperature of the substance will rise(that is known as specific heat capacity). Specific heat capacity and that is defined as the amount of heat required to raise the temperature of ${\text{1 kilogram}}$ of any substance by $1 kelvin$ and $1 kilocalorie\left( {1000 calories} \right)$ is the heat required to raise the temperature of ${\text{1 kilogram}}$ of water by ${1^\circ }C$.

Note:
As we all know, Heat is a form of energy and $SI$ unit of heat is $Joules$ which is a fundamental unit and in $CGS$ system heat is measured in $calories$. It is defined as the heat energy which we required to raise the temperature of $1 gm$of water by $1$°C and sometimes $kilo - calorie$ is also referred as a unit of heat and $1 kilo - calories = 1000 calories$. Also BTU is known as british thermal unit which is also used to measure heat which is defined as the amount of heat which is required to raise the temperature of one pound of pure liquid water by one degree Fahrenheit. It is also known as a heat unit in the United states.