A window comprises a metal frame and sheet of glass.
Hyrocarbon molecules consists of various arrangements of hydrogen and carbon atoms.
A pen’s cap is made of plastic or metal.
A 12 volt car battery is usually composed of six 2 volt cells connected in series.
The light box of an overhead projector consists of a powerful electric lamp.
Keys are made of metal.
A book comprises a stiff cardboard or paper cover and a number of pages.
A dictionary consists of an alphabetical list of words and explanations of their meaning.
A composition comprises a title, an introduction, a body and a conclusion.
Blade= the flat cutting part of a tool or weapon.
Some of special writing Examples:
A hacksaw is a tool which is used to cut wood and metal. It is composed of blade, frame, handle, adjusting screw and wing nut. It is made of metal.
A computer is a device which is used for data processing such as word-processing, graphics, calculation and electronic communication. It is composed of CPU, BIOS and RAM. It is made of plastic metal and silicon.
Definition: Nitrogen is a nonmetallic element which has an atomic number 7 and chemical symbol N. Thus, its atomic weight and its melting are 14, 0067 and -210 Celsius respectively. In addition, its boiling point is -195.8 Celsius.
USES: Nitrogen is used in industry for making ammonia (NH3), excluding oxygen and inhibiting combustion in many processes. Additionally, it has been used in a wide variety of dyes, drugs and explosives.
DISTRIBUTION: Nitrogen is the most abundant element in the Earth’s atmosphere (75% by weight).
When a switch is turned on, circuit starts to provide some continuous power. Then, the inert gases prevent the filament burning. Next, the filament is heated by the electric currents. Finally, the filament glows
The overhead projector works in the following way. First, the bulb is turned on. Then, the light goes through the rectangular lens and sheet of transparent plastic with an image on it. Next, the image goes through the small lens, which focuses it. After that, the mirror redirects the image through third lens, which magnifies it. Finally, the image appears on the screen.
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