# Which of the following is not a true statement about heat transfer? Whenever the temperature of something changes, a transfer of heat has occurred. Conduction is the transfer of heat by infrared rays. Light bulbs are examples of heat transfer by radiation. Convection occurs when a hot object moves to an area with less heat.

### Automotive Technology: A Systems A...

6th Edition
Jack Erjavec + 1 other
Publisher: Cengage Learning
ISBN: 9781133612315

### Automotive Technology: A Systems A...

6th Edition
Jack Erjavec + 1 other
Publisher: Cengage Learning
ISBN: 9781133612315

#### Solutions

Chapter
Section
Chapter 3, Problem 25RQ
Textbook Problem

## Which of the following is not a true statement about heat transfer? Whenever the temperature of something changes, a transfer of heat has occurred. Conduction is the transfer of heat by infrared rays.Light bulbs are examples of heat transfer by radiation.Convection occurs when a hot object moves to an area with less heat.

Expert Solution
To determine

The incorrect statement about heat transfer.

### Explanation of Solution

Whenever there is a difference in temperature between two substances, heat is transferred from the substance at a higher temperature to the substance at a lower temperature. This transfer of heat takes place by three modes which are discussed below.

Conduction:

It is the transfer of heat from a substance at a higher temperature to a substance at a lower temperature when the bodies are at direct or physical contact.

It is given by Fourier law: Q=KAdtdx.

Where, Q refers to the heat flow, K is the thermal conductivity of the substance or body, A is the surface area of heat flow, dt refers to the change in temperature or temperature difference, dx refers to the thickness of the substance in the heat flow direction.

Convection:

It is the transfer of heat from one body to another by the movement of the molecules

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