Two systems are said to be in chemical equilibrium with each other when their chemical potentials are same. 3) Thermal equilibrium: When the system is in mechanical and chemical equilibrium and there is no spontaneous change in any of its properties, the system is said to be in thermal equilibrium.
While scientists have known for some time that genetics play a role in alcoholism and other addictions, they also understand the tendency to be dependent on alcohol is more complicated than the simple presence or absence of any one gene.
Alcoholism is a specific type of addiction. There is no one single cause of alcohol addiction. Instead, there are multiple causes that can be grouped into four basic categories. These four categories are: biological causes, psychological causes, socio-cultural causes, and spiritual causes. Psychologists call this the Bio-Psycho-Social-Spiritual Model of addiction.