All about Thermodynamics &Thermal Properties of Matter in Class 11 Physics

Class 11 chapters lay the groundwork for advanced ideas covered in Class 12 chapters. As a result, students must have a thorough comprehension of fundamental ideas and theories, as well as formulae and derivations. Students learn all of the facts and functions connected to the chapter thermal characteristics of matter class 11 in depth. Our knowledgeable subject matter specialists have attempted to incorporate every detail and explain the characteristics of matter, physics, class 11, in an understandable manner. As a result, you will be able to learn about thermal expansion and superficial expansion, emissive power, absorptive power, and much more in this article.

Thermal Properties of Matter

In our universe, matter refers to everything that takes up space and has mass. We are almost surrounded by matter. We sit on the water bottle or the book bag as soon as we get off of the chair. Everything is made out of matter. And matter has some qualities that distinguish each one from the others and allow them to be distinguished. These characteristics include: Mechanical Properties- This refers to the physical characteristics of a substance, such as strength, elasticity, plasticity, and ductility. Chemical Qualities: Chemical composition, acidity or alkalinity, corrosive properties, and so on. It teaches us about conductivity, combustibility, density, and other physical properties. Dimensional Properties is a term that describes the size and shape of a substance. Thermal Properties- When a substance is exposed to heat or heat fluctuations, this property determines how it will behave.

Thermal properties of matter, as we currently know, are the ones that cause a matter to conduct heat or that determine the nature of the matter in the presence of heat. As a result, when heat moves through an item, it exhibits thermal characteristics. Alternatively, these qualities determine how matter reacts when faced to heat changes. Thermal characteristics are divided into four categories. Heat capacity, Thermal Expansion, Thermal Conductivity, and Thermal Stress are the four variables. Let’s take a closer look at these elements.

Heat Capacity

The amount of heat required by the body to change its temperature by one degree is known as heat capacity. The heat is measured in Joules or calories, while temperature changes, or simply the temperature, are measured in Celsius or Fahrenheit. How to Work Out Your Heat Capacity. The molar heat capacity of an item with a certain dimension is used to calculate its heat capacity. As a result, the formula is as follows: Q = m c ΔT.

Thermal Expansion

When heat travels through an item, the form of the thing changes. In other words, when something is heated, it expands. Thermal expansion is the property of stuff or an object that expands when heated. The form, volume, and surface area of things change as a result of thermal expansion. Gases have a considerable thermal expansion, whereas liquids and solids have a limited thermal expansion.

Linear Expansion

Linear expansion refers to a change caused by thermal expansion that is unidimensional or occurs in only one dimension. The formula is as follows: ΔL = αLΔT where,

  • ΔL is the change in length L
  • ΔT is the change in temperature
  • α is the linear expansion coefficient, which changes significantly with temperature.

Thermal Conductivity

All materials are not capable of transferring heat through their bodies. Conductors are those who can. It is because of the thermal conductivity that such materials allow heat to travel through them. There are high conductivity conductors which mean they conduct more heat than those with a low conductivity. Insulators are materials that do not transfer heat in any way. These items have obnoxious qualities.

Thermal Stress

The body is stressed as it expands or contracts due to thermal expansion or contraction. Thermal stress is the word for this. Thermal stress has the ability in harming a thing in some cases, hence it might be destructive in nature. You may have observed cracks in large truck tyres, for example. This is because high-speed driving causes heat formation which is produced by friction between the road’s surface and the tyres. The tyres shatter as a result of the resulting heat stress.

Emissive Power

The emissive power of a surface is the energy of thermal radiation that emits in all directions per unit time from each of the unit areas of a surface at any temperature. The Stefan-Boltzmann law can grant emissive power in the following ways: πIb = Eb = n 2σT 4. It is possible to determine the total radiant intensity and hemispheric total emissive power of a blackbody in a medium with a constant index of refraction n.

Important question, solve this: When a copper ball is heated, the largest percentage increase will occur in its?


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