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 be caused by a mental (psychological) condition, a general medical condition, or a substance such as alcohol or drugs. These three main causes are described in more detail below. Psychological causes. The underlying psychological cause often influences the type of psychotic episode someone experiences.