This incident was not unique. Fatalities from welding and hot work are often are associated with confined spaces and the areas adjacent to these confined spaces . The CSB has identified over 60 fatalities since 1990 due to explosions and fires from hot work activities on tanks, which are, of course, confined spaces.
moâ¢menâ¢tum. 1. force or speed of movement; impetus, as of a physical object or course of events: a career that lost momentum. 2. Mech. a quantity expressing the motion of a body or system, equal to the product of the mass of a body and its velocity.
The law of conservation of momentum states that the total momentum of a closed system does not change. This means that when two objects collide the total momentum of the objects before the collision is the same as the total momentum of the objects after the collision.losed system is used to mean that only the forces of the two objects colliding affects the motion of the objects. See Newton's third law of motion. If another force (called an external force) affects the motion of the objects then the momentum is not conserved, it will change.