Nootan Solutions Heat Transfer ISC Class-11 Physics Nageen Prakashan Chapter-18 Numericals of latest edition. Step by step Solutions of Kumar and Mittal ISC Physics Part-2 Class-11 Nageen Prakashan Numericals Questions. Visit official Website CISCE for detail information about ISC Board Class-11 Physics.

## Nootan Solutions Heat Transfer ISC Class-11 Physics Nageen Prakashan

 Class: 11 Subject: Physics Part-2 Chapter 18        Heat Transfer
 Board ISC Writer / Publications Nootan / Nageen Prakashan / Kumar and Mittal Topics Solved Numericals of page 724, 725

## Nootan Solutions Heat Transfer ISC Class-11 Physics Nageen Prakashan

#### Heat Transfer :

According to thermodynamic systems, heat transfer is defined as :

The movement of heat across the border of the system due to a difference in temperature between the system and its surroundings.

Interestingly, the difference in temperature is said to be a ‘potential’ that causes the transfer of heat from one point to another. Besides, heat is also known as flux.

#### Heat Transferred  Steps :

Heat can travel shift from one place to another in several ways. The different modes of heat transfer include :

• Conduction
• Convection

Thermal radiation is generated by the emission of electromagnetic waves. These waves carry away the energy from the emitting body. Radiation takes place through a vacuum or transparent medium which can be either solid or liquid. Thermal radiation is the result of the random motion of molecules in the matter. The movement of charged electrons and protons is responsible for the emission of electromagnetic radiation.

2. Conduction :

Conduction is defined as :

The process in which heat flows from objects with higher temperature to objects with lower temperature“.

An area of higher kinetic energy transfers thermal energy towards the lower kinetic energy area. High-speed particles clash with particles moving at a slow speed, as a result, slow speed particles increase their kinetic energy. This is a typical form of heat transfer and takes place through physical contact. Conduction is also known as thermal conduction or heat conduction.

#### 3. Convection :

Convection is defined as :

The movement of fluid molecules from higher temperature regions to lower temperature regions.”

### Chapter-18

Nootan Solutions Heat Transfer ISC Class-11 Physics Nageen Prakashan

Page No 724, 725

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