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.
Glossary of physics - P. 1  Parity (mathematics) â. 2  Parity (physics) â. 3  Paraffin 4  â. Particle accelerator 5  â. Particle displacement 6  â. Particle physics â A branch of physics which studies the nature of particles that are the constituents of what is usually referred to as matter and radiation. Pascal's Law â A principle in fluid mechanics that states that pressure exerted anywhere in a confined incompressible fluid is transmitted equally in all directions throughout the fluid such that the pressure variations (initial differences) remain the same.