The amount of heat required to raise the temperature of a given mass by unit value is called –

✅ Explanation: Specific heat is a physical property of a substance that measures the amount of heat energy required to raise the temperature of a unit mass of that substance by one degree Celsius (or one kelvin).

📌 Other Options Explanations:
-Option B (Thermal conductivity): Thermal conductivity is the ability of a material to conduct heat.
-Option C (Heat capacity): Heat capacity is the amount of heat required to raise the temperature of a given object (not necessarily a unit mass) by one degree Celsius (or one kelvin).
🔑 Important Key Points
-The quantity of heat required to raise the temperature of the unit mass of a material by one degree Celsius is called specific heat.
-Specific heat is often denoted by the symbol "C" and is expressed in units such as joules per gram per degree Celsius (J/g°C) or calories per gram per degree Celsius (cal/g°C).
-Materials with higher specific heat require more heat energy to raise their temperature, and they tend to retain heat for longer periods.
-Water, for example, has a relatively high specific heat, making it effective for storing and moderating temperature changes in various systems.