Safety
11 questions tagged Safety — spanning every one of the seven Ws.
How Does an Airbag Deploy?
Car airbags deploy in about 20-30 milliseconds: crash sensors detect sudden deceleration, triggering an electrical signal to an inflator that ignites a chemical propellant (sodium azide), rapidly generating nitrogen gas that fills the nylon bag.
Which is the safest country in the world?
Iceland has topped the Global Peace Index every year since 2008, making it widely regarded as the safest country in the world.
What Is a Rip Current?
A rip current is a narrow, fast-moving channel of water flowing seaward from the shore, caused by wave-driven water finding a return path.
How Does a Fire Extinguisher Work?
Fire extinguishers remove one or more elements of the fire triangle — heat, fuel, or oxygen — to suppress flames.
How Does a Smoke Detector Work?
Most home smoke detectors use an ionisation chamber or a photoelectric sensor to detect smoke particles in the air.
How Does a Black Box Survive a Plane Crash?
Flight recorders are encased in layers of stainless steel, titanium, and thermal insulation designed to withstand extreme impact, heat, and deep-sea pressure.
When was the three-point seat belt invented?
The modern three-point seat belt was invented by Swedish engineer Nils Bohlin at Volvo and introduced in 1959.
When was the first tornado siren system installed?
One of the earliest organized tornado siren systems appeared in the United States in the 1950s, after World War II warning networks expanded.
How do fire extinguishers put out fires?
Fire extinguishers stop fires by removing one or more parts of the fire triangle: heat, oxygen, fuel, or the chemical reaction itself. Different extinguishers work on different types of fires.
Why are alkali metals stored under oil?
They are stored under oil to keep them away from air and water. Alkali metals react quickly with both, sometimes dangerously.
Why does chlorine have such a strong smell?
Chlorine is highly reactive and irritates the sensitive tissues in your nose. Even small amounts can trigger a powerful warning smell.