## Specific Heat Capacity – Class 11 | Chapter – 11 | Physics Short Notes Series PDF for NEET & JEE

Specific Heat Capacity: Specific heat capacity (often simply referred to as specific heat) is the amount of heat required to raise the temperature of a unit mass of a substance by one degree Celsius (or one Kelvin) without a change in phase (i.e., without a change in state between solid, liquid, or gas).

The formula for specific heat capacity is:

c = Q / (m * ΔT)

Where:

• c is the specific heat capacity of the substance (in J/(g°C) or J/(g*K))
• Q is the amount of heat added or removed (in Joules, J)
• m is the mass of the substance (in grams, g)
• ΔT is the change in temperature (in degrees Celsius, °C, or Kelvin, K)

The units of specific heat capacity can be either J/(g°C) or J/(g*K), and they represent the amount of energy required to raise the temperature of one gram of a substance by one degree Celsius (or one Kelvin).

The specific heat capacity of a substance depends on its chemical composition and physical properties such as its phase, temperature, and pressure. Some substances, like water, have high specific heat capacities, which means they require a lot of energy to change temperature. Other substances, like metals, have low specific heat capacities, which means they require relatively little energy to change temperature.

It is an important concept in thermodynamics and is used in many applications, including the design of thermal insulation materials, the determination of the heat of reaction in calorimetry experiments, and the calculation of the energy required for heating or cooling processes.

## Need of Specific Heat Capacity

The concept of specific heat capacity is important in understanding how energy is transferred between different materials and how they respond to changes in temperature. The following are some reasons why specific heat capacity is needed:

• Energy Transfer: Specific heat capacity provides a measure of how much energy is required to change the temperature of a substance. This is useful in understanding how heat energy is transferred from one material to another. For example, if a hot metal object is placed in a cooler liquid, the rate at which the metal cools and the liquid heats up will depend on the specific heat capacities of the two materials.
• Temperature Changes: Specific heat capacity is necessary to calculate how much energy is required to cause a specific temperature change in a material. This is important in many practical applications, such as cooking, refrigeration, and heating.
• Material Properties: Specific heat capacity is a fundamental property of materials that is used to characterize their thermal behavior. Different materials have different specific heat capacities, which can be used to identify and distinguish between them.
• Thermodynamic Calculations: Specific heat capacity is used in thermodynamic calculations to determine the heat capacity, enthalpy, and entropy of materials. These values are important in understanding the behavior of materials under different conditions and in predicting the outcome of chemical reactions.

In summary, the concept is essential in understanding how energy is transferred between different materials and how they respond to changes in temperature. It is used in a wide range of applications, from cooking to thermodynamic calculations, and is a fundamental property of materials that characterizes their thermal behavior.

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Class 11 Physics Notes PDF

### Specific Heat Capacity – Class 11 |...

Class 11 Physics Notes PDF