Foam is an efficient thermal insulator, so the temperature of the oil can become difficult to control. The presence of air bubbles in the fluid can lead to excessive oxidation, cavitation, the reduction of lubricating properties of the oil and hydraulic system failure. Causes The causes of foaming are many. The most common include: Water contamination
Psychosis refers to an abnormal condition of the mind described as involving a loss of contact with reality. People with psychosis are described as psychotic. People experiencing psychosis may exhibit some personality changes and thought disorder.
Psychosis can occur as a result of brain injury or disease, and is seen particularly in schizophrenia and bipolar disorders. Psychotic symptoms can occur as a result of drug use, but this is not true psychosis. Diagnosis is by observation and interview.