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Revision notes on 4.2.2 Pressure for the CIE A Level Physics syllabus, written by the Physics experts at Save My Exams.
Pressure (p) is defined as the force perpendicular to a surface per unit area , and can be calculated using the following equation: p = A F Where F is the force acting perpendicular to the surface and A is its area. Using the defining equations of pressure and density, you can derive the formula p g Δh Δ =ρ used in section 5.1:
Physics A. CST992. Data, Formulae and Relationships. Values are given to three significant figures, except where more – or fewer – are useful. Physical constants.
A-level Physics data and formulae For use in exams from the June 2017 Series onwards Version 1.5 1
CAMBRIDGE INTERNATIONAL A LEVEL PHYSICS REVISION NOTES © RONALDO BUTRUS 2022 4.3 Density and pressure - Density,is measured in mass per unit volume (i.e. kg m1). - Pressure is measured in force per unit area (i.e. N m,. or Pascal (Pa)). - Hydrostatic pressure is given by: Δ"=F*Δℎ where Δ" is the difference in hydrostatic pressure (G9)
First published 2015. Printed in the United Kingdom by Latimer Trend. A catalogue record for this publication is available from the British Library. ISBN 978-1-107-61684-4 Paperback. Additional resources for this publication at www.cambridge.org/delange.
the Wien constant electron rest mass. 5.5 × 10–4 (equivalent to u) electron charge/mass ratio. proton rest mass (equivalent to 1.00728 u) proton charge/mass ratio. neutron rest mass. 1.00867 (equivalent to u) gravitational field strength. acceleration due to gravity atomic mass unit.
