Pressure (symbol: p or P) is the force applied perpendicular to the surface of an object per unit area over which that force is distributed. Gauge pressure (also spelled gage pressure) is the pressure relative to the local atmospheric or ambient pressure. Various units are used to express pressure.
A BMI of 25 to 29.9 indicates a person is overweight. A person with a BMI of 30 or higher is considered obese. Like the weight-to-height table, BMI does not show the difference between excess fat and muscle. BMI, however, is closely associated with measures of body fat. It also predicts the development of health problems related to excess weight.
An overweight person has a body mass index (BMI) of 25.0 to 29.9. However, obesity is a state when excessive amount of body fat is stored in the body as compared to the mass. The body mass index of an obese person is 30.0 to 39.9. A person who has a BMI of 40.0 or above is considered as terribly obese.