when taking a HP boiler off line, open the drum vent valve _____ a) at 25 psi  b) immediately c) at 85% of header pressure d) whenever you're good and ready

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Applied Fluid Mechanics

A fluid is a substance that is continuously deformed by the application of shear stress. The rate of deformation of a fluid depends on its viscosity. The fluid tries to flow when it interacts with some other system.