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.
In physics, the momentum of an object is the amount of energy it  has moving in a direction. It is a product of its mass (weight) and  its velocity (speed and direction) as â¦ in (momentum = Mass times  velocity). Momentum changes when speed is increased or decreased,  its direction changes, or its mass changes.   An example of changing momentum is an object in space such as a  meteor falling to the earth.