An epidemic occurs when an infectious disease spreads rapidly to many people. For example, in 2003, the severe acute respiratory syndrome (SARS) epidemic took the lives of nearly 800 people worldwide. disease outbreak happens when a disease occurs in greater numbers than expected in a community or region or during a season. An outbreak may occur in one community or even extend to several countries. It can last from days to years. Sometimes a single case of a contagious disease is considered an outbreak.
Quick Answer. Bitumen is primarily used to pave roads. It is a brown or black mixture of hydrocarbons, which is derived from petroleum. The consistency of bitumen varies from viscous to solid, and in its solid form, it is commonly known as asphalt. Continue Reading.
Multi-Ply Modified. Bitumen membranes have a stable thickness while. single-ply membranes have annual thickness loss due to. weathering. Evolved from time-tested BUR roofs, the standard. commercial roof application for over 100 years, modified bitumen roofs have membranes modified with. SBS to attain rubber-like qualities or APP to attain the. durability of plastic. The choice is matched to the needs. of the building roof.