Ideas of normal and abnormal are largely shaped by social standards and can have profound social ramifications. Learning Objective. Analyze the challenges inherent in trying to define normal and abnormal. What is considered normal changes with changing societal standards. Despite the challenges inherent in defining normal, it is still important to establish guidelines so as to be able to identify and help people who are suffering. This is the goal of the Diagnostic and Statistical Manual of Mental Disorders (known as the DSM-5), a publication in the field of clinical psychology.
Launching a water rocket. The rocket is in its peak with no water inside it. Water and gas are used in combination, with the gas providing a means to store energy, as it is compressible, and the water increasing the propellant mass fraction and providing greater force when ejected from the rocket's nozzle.
Condensation on Propane Bottles. Why does the propane bottle develop condensation or frost on the outside while in use? As propane is drawn from the cylinder during the operation of a lantern, the liquid in the cylinder turns to vapor at the top of the tank before it passes through the tank valve and into the lantern valve. This draws heat from the cylinder and the surrounding air.