Fire extinguishers

In Applied Sciences, we were given a special lesson on how to use a fire extinguisher and what to do in case of emergency. First they began showing us the parts of the extinguisher and that before using it, we had to remove the ring that prevents it from start working. They also informed us that every time we go to a public place like a restaurant, we know where the emergency exits are. We were told that the classroom chairs sould be properly set, because otherwise in case of fire it could bother people or cause accidents.