<h1>PROPERTIES OF CERAMICS; PROPERTIES OF GLASS</h1> <p>CONTENT</p> <p>Properties of Ceramics</p> <ol> <li>Definition of Ceramics</li> <li>Classification of Ceramic Materials</li> <li>Properties of Ceramics</li> </ol> <p>Properties of Glass</p> <ol> <li>Definition of Glass</li> <li>Properties of Glass</li> <li>Uses of Glass</li> </ol> <p> </p> <h2>Properties of Ceramics</h2> <h3>Definition of Ceramics</h3> <p>Clay exists naturally in many parts of the world. When it is wet, it can easily be molded into different shapes and sizes. We use clay to mould various objects like storage pots, cooking pots and dishes.</p> <p>We use mud to construct support for cooking pots, to build houses and also to make bricks for building houses. We make cement blocks that we use for building houses by mixing sand and cement to get typical shape. All the above solid objects made from clay, mud or cement are called ceramics.</p> <p>Ceramics break easily when dropped. We say they are brittle; this differentiates ceramics from metals, plastics, wood and rubber. Ceramics are less dense than most metals. They have high melting points.</p> <p>They are a very large group and have very wide uses such as:</p> <ol> <li>Refractory ceramics (high temperature bricks) for furnaces and flue linings.</li> <li>Tiles, such as roof tiles, glazed and unglazed floor and wall tiles, including white tiles.</li> <li>Sanitary fittings of all kinds usually known as white ware</li> <li>Common brick to high grade engineering brick used for the construction of machinery bases. Basically, they are of:</li> </ol> <p style="padding-left: 40px">(a) Structural clay products, including common bricks and sewer bricks. These products are dried and fired for strength after being made from a mixture of clay and shale.</p>

<h1><strong>BASIC ELECTRONIC DEVICES</strong></h1> CONTENT <ol> <li>Definition of Basic Electronic Devices</li> <li>Types of Basic Electronic Devices</li> <li>Uses of Basic Electronic Devices</li> </ol>   <h2><strong>Definition of Basic Electronic Devices</strong></h2> The basic electronic devices are the devices which emit and control the movement of electrons in a desirable manner used in generation of electronic appliances<strong>.</strong> <h2><strong>Types of Basic Electronic Devices</strong></h2> The following are the types of basic electronic devices: <h3>1. Semi Conductors</h3> <img class="size-full wp-image-19731 aligncenter" src="https://classhall.com/wp-content/uploads/2018/06/basic-electronic-devices-semi-conductors.jpg" alt="Basic electronic devices - Semi conductors" width="378" height="237" /> <h3>2. Resistors</h3> <img class="aligncenter wp-image-19732 size-full" src="https://classhall.com/wp-content/uploads/2018/06/basic-electronic-devices-resistor.jpg" alt="Basic electronic devices - Resistors" width="397" height="227" />

<h1>BUILDING MATERIALS</h1> <p>CONTENT</p> <ol> <li>Definition of Building</li> <li>Common Building Materials</li> <li>Identification of Buildings by Materials</li> <li>Uses of Building Materials</li> <li>Uses of Buildings</li> <li>Types of Buildings</li> </ol> <p> </p> <h2>Definition of Building</h2> <p>A building is a structure which is designed by the architects or draughtsman and built for the purpose of providing shelter for human beings. Building materials are the materials used to construct buildings and other structures.</p> <p> </p> <h2>Common Building Materials </h2> <p>The following are the common building materials:</p> <p>(i) Cement (ii) Sand (iii) Gravel (iv) Metal (v) Plastics (vi) Wood (vii) Glass (viii) Leaves (ix) Ceramics (x) Grass, etc.</p> <p><img class="size-full wp-image-19727 aligncenter" src="https://classhall.com/wp-content/uploads/2018/06/building-materials.jpg" alt="Building materials" width="368" height="259" /></p> <p style="text-align: center"><strong>Building Materials</strong></p> <p> </p> <h2>Identification of Buildings by Materials</h2> <p>Buildings are identified by the types of materials with which they are erected. They are:</p> <ol> <li><strong>Mud Buildings:</strong> These are erected with loamy or clayed soil which has been properly treated to plastic nature.</li> <li><strong>Brick Building: </strong>Bricks are molded from dried mortar (a mixture of cement, sand and lime and at times clay burnt in a kiln. There two types of Brick Building:</li> </ol> <p style="padding-left: 40px">(i) The Sun dried bricks (ii) The fire burnt bricks (Red bricks)</p> <ol start="3">