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.
[edit] Spin. Spin is a quantized property of all particles, both matter and force, in the universe. Matter particles have half-integer spin (1/2, 3/2,...) and force particles integer spin (0, 1, 2,...). Spin is intrinsic angular momentum possessed by the particles.