Airbag system

A great revolution in automobile industries is the implementation of Airbag system. Engineers are working continuously to on the safety of a person travelling in any automobile. In fact to provide support to seat belt and to reduce the impact on body, during any mishappening an airbag system has really become the most important part of safety component. During recent years airbag implementation has saved thousand of lives from injury and death.
So, let’s see how an air bag system really works. Basically airbags are  fabric bags made of stretchable material and kept in different locations through tight packing. In most of the automobiles, airbags are  kept near front two seat as they are the first to be affected in case of any accident. These bags are compressed to fix in small area and to respond quickly. Whenever there will be accident it will get filled with air and act as cushion  to reduce the impact. But one cannot rely fully on airbags that they will prevent any injury or death due to accident, so to have confidence on this system one must regularly keep a check of its functioning on a regular basis.
There are two major components of Airbag crash sensor and insulator.
Crash sensor: Crash sensor are the small electronic device to feel the different movement’s of an automobile. They respond to the sudden brakes, shock and pressure or temperature change which can be seen due to the force of Collision. They measure the speed of car number of seat occupied break pressure and impact. The sensor analyse data and send signals to relay. There are two kinds of Crash Sensor, one is electrical sensor design with a concept of electro-mechanical ball and tube mechanism and second is mechanical sensor work without any electrical sensor it is like actuator with firing pin and and cannot be deactivated.
Inflator: Once the crash unit identify that there is a crash it immediately send signal to inflator to feed air in air bag and once airbag fills up it burst out of panel cover into open space to protect passengers.
All these activities take 20-25 milliseconds and once it is deployed it cannot be used for second time. So you need to change your airbags.

Types Of Fire Extinguisher And Their Uses

In our everyday life, we have to deal with fire directly or indirectly. Fire is one of the essential source of energy in our life & on the other hand it is very dangerous too.

In case of emergency we should know how to get control over it. Basically fire can be caused due to four kind of substances, i.e, liquid products, gaseous products, solid products and electrical products. And based on nature of fire in industries and domestic area we have different opinions to control it.
In bigger industries, hotels malls etc generally fire fighting pipe line along with sprinklers are being provided while for smaller areas fire extinguishers are used.  Fire extinguisher can be divided into following ways according to its use and nature.

Class A: SOLIDS such as paper, wood, plastic etc
Class B: FLAMMABLE LIQUIDS such as paraffin, petrol, oil etc
Class C: FLAMMABLE GASES such as propane, butane, methane etc
Class D: METALS such as aluminium, magnesium, titanium etc

Class E: Fire involving ELECTRICAL APPARATUS