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# NCERT Solutions for Class 11 Physics Chapter 11 – Thermal Properties of Matter

NCERT Solutions for Class 11 Physics Chapter 11 Thermal Properties of Matter provide answers to all the questions in NCERT physics textbook. All the formulae and exercises have been explained with the help of examples and also simplified explanations of each and every topic are there for your easy understanding.

Chapter 11 of NCERT Solutions for Class 11 Physics Book contains 2 exercises and 22 questions in total. By solving these questions, you will learn about heat, various processes through which heat flows from one body to another and other associated factors. The chapter also includes concepts such as the effect of temperature and heat on matter. After mastering the different topics of the chapter, you will be able to solve all the NCERT questions available in the exercise with confidence.

The NCERT Solutions for Class 11 Physics Chapter 11 by subject matter experts at Instasolv, provide you with a thorough explanation of all exercises in a detailed manner along with the examples and figures for a better explanation. The CBSE syllabus for Class 11 Physics is kept in mind while preparing these solutions.

## Important Topics for Class 11 Physics Chapter 11 – Thermal Properties of Matter

NCERT Solutions for Class 11 Physics Chapter 11 will help you grasp some important topics of Physics such as measurement of temperature through graphical representation and thermal expansion, modes of heat transfers i.e, conduction, convection and radiation along with mathematical explanations.

Temperature and Heat

In this section of the chapter, you will learn about the heat and temperature and also about their S.I Unit and the relationship of Fahrenheit and Celsius. Heat is the form of energy transferred between two or more systems and its surroundings by virtue of the temperature difference. The S.I unit of heat energy is transferred in Joule (J); 1 cal = 4.186 J

Temperature, as defined in the chapter, is the degree of coldness or hotness of the substance. The S.I. unit of temperature is Kelvin (K) and is the most common unit of temperature. The temperature of a body is measured with the help of a thermometer.

The two different scales of temperature Fahrenheit and Celsius are mentioned and the relationship between them is explained.

where tc and tf are temperature values of the body on Celsius and Fahrenheit scale.

Thermal Expansion

Thermal expansion is an increase in the size of a body due to temperature. Three different types of expansions have been explained in this chapter which is as mentioned below:

Linear Expansion: The increase in the length of a solid on heating is called linear expansion. It is given by the equation:

𝞓= l ∞𝞓t

where l is the original length of any solid, ∆t is the increase in the temperature of the rod.  The length so increased is shown by ∆l

Superficial Expansion: The increase in the surface area of the solid is known as superficial expansion.

Volume Expansion: The increase in the volume of the solid is known as volume expansion.

The relationship between the three types of equation is shown by the below equation:

Where α, β and γ are not constant, they depend on the temperature range.

Newton’s Law of Cooling

It is one of the important laws covered under the chapter which states that the rate of heat loss of a body is directly proportional to the differences in temperatures between the body and its surroundings.

Some more important topics are discussed in this chapter.

Important formulae covered in this chapter

• Thermal Stress

= Thermal stress = Y α ∆ t

• Basic Heat formula

Q = m * S * t

i.e, Heat required = mass * specific heat * change in temperature

• Heat Transfer

where K is called thermal conductivity and A is an area of cross-section.

### Discussion of Exercise of NCERT Solutions for Class 11 Physics Chapter 11

• NCERT Class 11 Physics Chapter 11 consists of 2 exercises that include 22 questions of numerical type.
• The first exercise has 20 questions related to temperature, heat, pressure, linear expansion, power and latent heat of evaporation. It also includes a theoretical question which will help you understand the topics of the chapter in a better way.
• The second exercise is an additional exercise that has 2 questions based on the P-T Phase diagram of carbon dioxide.

### Benefits of NCERT Class 11 Physics Chapter 11 Solutions by Instasolv

For a better understanding of the concepts of NCERT Solutions for Class 11 Physics Chapter 11, you need to refer to the NCERT solutions prepared by the Instasolv experts. Our solutions focus on the concepts of the chapter rather than just providing the answers. Step by step process provided to solve the numerical questions helps in better understanding. We have included graphs and diagrams to help you grasp the concepts faster. Get ready to score more marks in CBSE Class 11 exams with the help of our solutions.

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