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Questions and model answers on 1.9 Pressure for the CIE IGCSE Physics syllabus, written by the Physics experts at Save My Exams.
Gauge pressure is positive for pressures above atmospheric pressure, zero at atmospheric pressure, and negative for pressures below atmospheric pressure. The total pressure is commonly referred to as the absolute pressure P a b s o l u t e . Absolute pressure measures the pressure relative to a complete vacuum.
where \ (P_ {abs}\) is absolute pressure, \ (P_g\) is gauge pressure, and \ (P_ {atm} \) is atmospheric pressure. For example, if your tire gauge reads 34 psi (pounds per square inch), then the absolute pressure is 34 psi plus 14.7 psi (\ (P_ {atm}\) in psi), or 48.7 psi (equivalent to 336 kPa).
pabs = pg +patm (14.4.1) (14.4.1) p a b s = p g + p a t m. where p abs is absolute pressure, p g is gauge pressure, and p atm is atmospheric pressure. For example, if a tire gauge reads 34 psi, then the absolute pressure is 34 psi plus 14.7 psi (p atm in psi), or 48.7 psi (equivalent to 336 kPa).
Pressure is the force per unit area of a surface, so the particles are exerting a pressure on the container. Pressure in a fluid causes a force at right angles (normal) to any surface. The pressure at a certain surface can be calculated using: \textcolor {aa57ff} {p = \dfrac {F} {A}}
15.1: Pressure. Page ID. The pressure exerted by a force, →F, over a surface with area, A, is a scalar quantity, P, defined as: P = F ⊥ A. where F ⊥ is the component of the force perpendicular to the surface. The SI unit for pressure is the Pascal (Pa).
Key points. Pressure is a measure of how concentrated (or spread out) a force is. The amount of pressure exerted on an object depends on the force applied and the surface area it is spread...
