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Other Chapters For 7th Class

  • 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

  • 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

  • 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...

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Heat Energy Transfers IGCSE 7th Class Science Chapter 27

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

Other Science Chapters For 7th Class

  • 7th Class Science Chapter 28

  • 7th Class Science Chapter 26

  • 7th Class Science Chapter 25

  • 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

  • 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...

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