Why a metal chain is hung below a truck carrying explosive device?

When the truck moves, friction is produced between the tyres and road. This creates charges capable of causing the explosives, with the help of sparks, to catch fire and explode. The metal chain is used to carry the charges down to the earth, so as to prevent any catastrophes from happening along the way.

Why a long vehicles travel with a metal chain touching the ground?

The trucks carrying explosives have a metal chain touching the ground ,True. The main motive is to do earthing so that the charges flow down in the earth and prevent the truck from getting blown up or you can also say preventing the explosives to blast.

What is the purpose of the chains dangling from the rear of gasoline trucks?

To avoid it, the truck has a metal chain on its body dangling to the ground so that the positive charge on its metal body gets neutralised by the electrons coming from the ground through the metal chain.

Why do fuel trucks have metal chains?

Movement of vehicle on road produces electric charges and hence sparking due to rubbing of tyres on road which is very dangerous since petrol is very inflammable. Metal chains that drag along the road helps in absorbing these dangerous electric charges produced by vehicle’s tyres.

Why do trucks have chains hanging?

The tire chains are usually seen hanging underneath the trailer where they are kept for storage by truckers who regularly travel through slick roads. Occasionally they need to strap them around their tires to gain better traction.

Why do trucks hang tires?

When they have a heavy load they will lower these wheels to touch the ground and spread the load between all wheels. When lightly loaded they raise the wheels – this reduces drag and wear on the tires because the tandem and triple axle wheels not being steerable, scrub something awful on the road when making any turns.

Why are there chains under school buses?

The chains are designed to provide traction on snow-packed and icy roads and struggle to function in thick snow, Snoozy said. If a bus is stopped at the top of a snowy hill, the chains will stop moving and won’t provide the traction needed to help the bus keep going.

Why do some fuel trucks have chains that touch the road?

Gasoline is flammable, which means if a spark gets to it, it could catch on fire. A gasoline truck or any container that holds gasoline is vulnerable to sparks due to friction from moving the container. So containers for gasoline and vehicles moving gasoline typically have a wire or chain to “ground” them.

Why do fire trucks have chains hanging from rear axle?

When the tires rotate, they catch the chains, greatly improving traction on icy or slick roads. You can see how they deploy and work in the video above. The automatic chain devices are typically seen on vehicles that need to be able to confront and cope with varying road conditions in a split second.

Why do emergency vehicles have chains underneath?

Chains are fitted underneath the ambulance to ensure the vehicle is always grounded. Air contains a lot of electrons, and they move from areas of high density to areas of low density. As the ambulance comes into contact with these electrons, the risk of static electricity increases.

Why do some trucks drag chains?

The idea of dragging a chain beneath a truck or a Strap in the case of a Car was supposed to disperse the static electricity which could cause a Fire in the case of the truck or cause Car Sickness in the occupants of the car.

https://www.youtube.com/watch?v=Gg5Zw9KlVdQ