### Other Chapters For 7th

• 7th-class Maths Chapter 28

Statistics is a branch of mathematics dealing with the collection, analysis, interpretation,...
• 7th-class Maths Chapter 28

Division is one of the four basic operations of arithmetic, the others being addition,...
• 7th-class Maths Chapter 27

n probability theory, an experiment or trial (see below) is any procedure that can be infinitely...
• 7th-class Maths Chapter 26

The only difference between cubes and cuboids is the shape of the six faces. Each face of...
• 7th-class Maths Chapter 25

In calculus, integration by substitution, also known as u-substitution, is a method for finding...
• 7th-class Maths Chapter 24

Proportionality may refer to: Proportionality (mathematics), the relationship between two...
• 7th-class Maths Chapter 23

Probability is the measure of the likelihood that an event will occur. See glossary of...
• 7th-class Maths Chapter 22

The 'perimeter' of a shape is the distance around it. In order to calculate the perimeter of a...
• 7th-class Maths Chapter 19

A fraction (from Latin fractus, "broken") represents a part of a whole or, more generally, any...
• 7th-class Maths Chapter 18

Mental calculation or mental maths is an old mathematical tool. It is doing maths without using...

# 7th Class Chapter No 27 - Heat Energy Transfers in Science for IGCSE

Heat transfer is a discipline of thermal engineering that concerns the generation, use, conversion, and exchange of thermal energy (heat) between physical systems. Heat transfer is classified into various mechanisms, such as thermal conduction, thermal convection, thermal radiation, and transfer of energy by phase changes. Engineers also consider the transfer of mass of differing chemical species, either cold or hot, to achieve heat transfer. While these mechanisms have distinct characteristics, they often occur simultaneously in the same system. Heat conduction, also called diffusion, is the direct microscopic exchange of kinetic energy of particles through the boundary between two systems. When an object is at a different temperature from another body or its surroundings, heat flows so that the body and the surroundings reach the same temperature, at which point they are in thermal equilibrium. Such spontaneous heat transfer always occurs from a region of high temperature to another region of lower temperature, as described in the second law of thermodynamics.
Posted in 7th on February 13 2019 at 03:29 PM

### IGCSE 7th CLASS Science OTHER CHAPTERS

• 7th-class Science Chapter 28

Energy is an important ingredient in all phases of society. We live in a very interdependent...
• 7th-class Science Chapter 26

forms of energy: thermal (heat), light, electrical, sound, kinetic, chemical, nuclear and...
• 7th-class Science Chapter 25

Energy cannot be created or destroyed, only converted from one form to another. These...
• 7th-class Science Chapter 24

In everyday use and in kinematics, the speed of an object is the magnitude of its velocity (the...
• 7th-class Science Chapter 23

In physics, a moment is an expression involving the product of a distance and a physical...
• 7th-class Science Chapter 22

At terminal velocity the gravitational force down equals the air resistance force up. vehicle...
• 7th-class Science Chapter 21

The density, or more precisely, the volumetric mass density, of a substance is its mass per unit...
• 7th-class Science Chapter 20

Measurement is the assignment of a number to a characteristic of an object or event, which can...
• 7th-class Science Chapter 19

The periodic table is a tabular arrangement of the chemical elements, ordered by their atomic...
• 7th-class Science Chapter 18

A metal is a material (an element, compound, or alloy) that is typically hard when in solid...