HEATING AND COOLING: ENERGY TRANSFER BY HEATING

Description

Mind Map on HEATING AND COOLING: ENERGY TRANSFER BY HEATING, created by gxbs_ on 05/11/2014.
gxbs_
Mind Map by gxbs_, updated more than 1 year ago
gxbs_
Created by gxbs_ almost 11 years ago
55
0

Resource summary

HEATING AND COOLING: ENERGY TRANSFER BY HEATING
  1. Heat can be transferred from place to place by conduction, convection and radiation. Dark matt surfaces are better at absorbing heat energy than light shiny surfaces. Heat energy can be lost from homes in many different ways and there are ways of reducing these heat losses.

    Annotations:

    • Conduction: the transfer of heat energy through a material - without the material itself moving. Convection: the transfer of heat energy through a moving liquid or gas. Radiation: electromagnetic radiation emitted from a hot object.
    1. INFRARED RADIATION
      1. All objects emit (give out) and absorb thermal radiation, which is also called infrared radiation. The hotter an object is, the more infrared radiation it emits.
        1. Infrared radiation is a type of electromagnetic radiation, which involves waves rather than particles. This means that unlike conduction and convection, radiation can even pass through the vacuum of space.
          1. This is why we can still feel the heat of the sun, although it is 150 million km away from earth.
        2. KINETIC THEORY
          1. The kinetic particle theory explains the properties of the different states of matter. The particles in solids, liquids and gases have different amounts of energy. They are arranged differently and move in different ways.
          2. CONDUCTION
            1. Heat energy can move through a substance by conduction. Metals are good conductors of heat but non-metal and gases are usually poor conductors of heat.
              1. Poor conductors of heat are called insulators. Heat energy is conducted from the hot end of an object to the cold end.
                1. Heat conduction in Metals: the electrons in piece of metal can leave their atoms and move about in the metal as free electrons. The parts of the metal atoms left behind are now charged metal ions.
                  1. The ions are packed closely together and they vibrate continually. The hotter the metal, the more kinetic energy these vibrations have. This kinetic energy is transferred from hot parts of the metal to cooler parts by the free electrons. These move through the structure of the metal, colliding with ions as they go.
            2. CONVECTION
              1. Liquids and gases and fluids. The particles in these fluids can move from place to place. Convection occurs when particles with a lot of heat energy in a liquid or gas move and take the place of particles with less heat energy.
                1. Heat energy is transferred from hot places to cooler places by convection.
                  1. Liquids and gases expand when they are heated. This is because the particles in liquids and gases move faster when they are heated than they do when they are cold. As a result, the particles take up more volume. This is because the gap between particles widens, while the particles themselves stay the same size.
                    1. The liquid or gas in hot areas is less dense than the liquid or gas in cold areas, so it rises into the cold areas. The denser cold liquid or gas falls into the warm areas. In this way, convection currents that transfer heat from place to place are set up.
                Show full summary Hide full summary

                Similar

                Sociology
                shattering.illus
                Physical Geography
                littlegoulding
                American West - Key Dates
                Rachel I-J
                Exchange Surfaces and Breathing Quiz
                gordonbrad
                P4: Explaining motion
                thegeekymushroom
                Input Devices
                Jess Peason
                Psychology A1
                Ellie Hughes
                Romeo and Juliet: Key Points
                mbennett
                Chemistry C1
                Phoebe Drew
                Forms of Business Ownership Quiz
                Noah Swanson
                The Great Gatsby - Aspects of Narrative
                Sophie Beckingham