# Concept of Heat Transfer

#### Academic Questions in PhysicsPlease check out our Test Your Knowledge page to see all Questions and Answers The Law of Inertia is also referred to as _____. A. 1st Law of Thermodynamics B. 2nd Law of Thermodynamics C. 3rd Law of Thermodynamics D. Newton's 1st Law of Motion E. Newton's 2nd Law of Motion F. Newton's 3rd Law of Motion The process whereby the velocity of an object increases and decreases over a period of time is best associated with the term _____. A. Speed B. Velocity C. Momentum D. Constant Velocity E. Acceleration F. Average Velocity The rate of motion is best referred to as _____. A. Speed B. Velocity C. Momentum D. Inertia E. Acceleration F. Constant Velocity Consider this expression below: A body X exerts a force FX on another body Y. In return, body Y exert a force FY back on body X. The forces FX and FY are equal in magnitude but opposite in direction. Putting the above expression into equation: FX = -FY Where FX is the action force FY is the reaction Force The above expression relates to _____. A. Theory of Force B. Force Postulate C. Einstein's proposal on Relativity D. Newton's 1st law of motion E. Newton's 2nd law of motion F. Newton's 3rd law of motion The tendency of a body to remain in a state of rest or in uniform motion is referred to as _____. A. tension B. uniform acceleration C. constant acceleration D. deceleration E. inertia F. velocity A change in the position of an object with reference to time is best described as _____. A. momentum B. displacement C. velocity D. acceleration E. direction F. motion The saying "what goes up on earth must come down" can be best attributed to _____. A. force B. motion C. mass D. acceleration E. average velocity F. constant velocity We have _____ laws of Thermodynamics. A. 1 B. 2 C. 3 D. 4 E. 5 D. 6

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### Heat Transfer:

Heat is a form of energy. It cannot be lost according to the First Law of Thermodynamics; rather it will be transferred.

The First and Second Laws of thermodynamics are stated below:

Energy can neither be created nor destroyed but can be transformed or converted from one form to another.

1 st Law of thermodynamics

In the course of energy transfer, some energy is lost in the form of heat to the surroundings.

2 nd Law of thermodynamics

Heat transfer indicates how heat flows between two systems of varying temperature.

Note: Heat will always be transferred from the region of higher temperature to the region of lower temperature.

To better understand how the processes of heat transfer are achieved, it will be great if we first understood how the particles of matter move.

Below is a quick explanation of the particulate nature of matter:

Matter is composed of particles which can either be:

1. Tightly packed together (as seen in Solids).
2. Loosely packed together (as seen in Liquids).
3. Completely separated (as seen in Gases).

Note: The movement of the particles of matter is a function of the kinetic energy present in them. (Think of kinetic energy as energy in motion).

From the above explanations, we can therefore conclude that gaseous particles have got the highest kinetic energy while solid particles have got the least kinetic energy.

An increase in particles' vibrational, rotational or translational motion will imply an increase in temperature while a decrease in the particles motion (vibrational, rotational and translational) will mean a decrease in temperature.

We can thus define temperature as the measure of the average kinetic energy possessed by the particles of matter.

From the above explanations on the movement of particles, we can now properly explain the transfer of heat.

### Methods of Heat Transfer

Heat can be transferred through: Alfred Ajibola is a Medical Biochemist, a passionate Academician with over 7 years of experience, a Versatile Writer, a Web Developer, a Cisco Certified Network Associate and a Cisco CyberOps Associate.

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