An explosives trace detector is a special machine that helps to find tiny particles of explosives that may be present in the air around us. Imagine that you are looking for tiny ants in a big room filled with lots of stuff. The explosives trace detector is like a special machine that helps you to find those ants that are too small to see with your eyes.
The explosives trace detector works by using a special filter that collects small particles that are floating in the air. It then examines these particles to see if they contain any traces of explosives. When explosives are present in the air, they leave behind very tiny particles that can stick to surfaces or float around in the air.
The machine has a special detector that can sense these small particles, almost like a superhero with a super sense of smell. If the machine senses anything that looks like an explosive particle, it will raise an alarm to let the people in the area know that they may need to check for a possible threat.
Explosives trace detectors are used in many different places, such as airports, train stations, and other public places where it's important to keep people safe. They help security teams to find and prevent any threats from explosives that could harm people.