According to the Center of Disease Control and Prevention (CDC), death from fire injury is the third common unintentional cause of fetal home injury. As fire claims the lives of many people each year and destroys properties and belongings; Smoke detectors play a big and important role in preventing such fires. Smoke detectors are devices that detect smoke or other combustion products and when they sense them an alarm will sound alerting people for the danger of fire.
There are two types of smoke detectors:
1- Ionization smoke detectors: this device detects smoke particles emitted from fire whether they are visible or invisible. Smoke changes the electric current which triggers the start of the alarm.