Acids react with compounds such as potassium carbonate, sodium bicarbonate or calcium bicarbonate to liberate carbon dioxide gas, with a brisk effervescence leaving behind salt solution. This property of acids is widely used in soda acid fire extinguishers since carbon dioxide does not support combustion.255 A soda acid fire extinguisher consists of a glass bottle filled with sulphuric acid. This bottle is placed over sodium bicarbonate solution placed in a closed container. When the knob of the container strikes the acid bottle the bottle breaks and thus the acid reacts with baking soda and liberates carbon dioxide. The carbon dioxide thus formed is forced out with the liquid through the nozzle to extinguish the fire.
Friends you know a keyboard is the most important part of a computer. It consists of different sets of keys that help us to enter information into the computer. Today we will discuss about keyboard and its keys types and use. A standard keyboard has 104 keys. Types of Keys in a Keyboard: Alphabet Keys Number Keys Special Keys Function Keys Navigation Keys 1. Alphabet Keys: 26 alphabet keys are present on a keyboard from A to Z. these keys are not present in the alphabetical order. These keys are used to type words, sentences or paragraphs. 2. Number Keys: These keys are used for typing numbers. These keys are present above the top row of the alphabet keys and also present on the right side of the keyboard. 3. Special Keys: Keyboard has more special keys such as Space bar Key, caps lock key, backspace key, shift key, enter key, symbol keys and tab key etc. 4. Function Keys: 12 function keys are present on a keyboard. They keys are
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