Excessive pressure or urging.
This is the pressure in excess of the ambient value that is created by the explosion process. The peak overpressure associated with deflagrations inside closed vessels can be as high as 10 times the initial pressure.
The pressure resulting from the blast wave of an explosion. It is referred to as "positive" when it exceeds atmospheric pressure and "negative" during the passage of the wave when resulting pressures are less than atmospheric pressure. (Joint Pub 1-02)
the transient pressure that is created by the shock wave of an explosion and exceeds the ambient pressure; expressed in pounds per square inch
Minimum operating pressure of a hot water boiler sufficient to prevent the water from steaming.
increased atmospheric pressure (positive overpressure), followed by a wave of decreased atmospheric pressure (negative overpressure), produced around the origin of an explosive or violent detonation
a transient air pressure greater than the surrounding atmospheric pressure; "the overpressure of the blast kills by lethal concussion"
Formation pressure in excess of hydropressure.
Too much pressure, causing ink to tend to plug letters, especially halftone dots.
the maximum specified pressure which may be applied to the sensing element of a sensor without causing a permanent change in the output characteristics.
the wall of compressed air created in the aftermath of a nuclear explosion. Overpressure can collapse buildings, uproot trees, and crush people.
Is an expression which has been used commonly to refer to high pressure found in some formations; super-normal pressure or surpressure. Technically, it should be said that overpressure is that amount of pore pressure which is in excess of normal pore pressure in overpressured formations.
The amount of pressure above normal atmospheric that accompanies a blast wave. Peak overpressure is the maximum value of overpressure at a given location; it is usually produced at the moment the shock or blast wave reaches that point. The peak overpressure associated with deflagrations inside closed vessels can be as high as 10 times the initial pressure. See Blast Wave.
Overpressure, in geology, is a term used to describe the pressure regime in a stratigraphic unit that exhibits higher-than-hydrostatic pressure in its pore structure. This phenomenon is the primary cause of "oil gushers". Overpressure is also used, in military terminology, to refer to the pressure caused by an explosion over and above normal atmospheric pressure, especially when measuring the effects of nuclear weapons or thermobaric bombs.