Remarks on the notion of “pressure” |
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| Institution: | 1. Institute of Materials Science, University of Connecticut, Storrs, CT, USA;2. Department of Molecular and Cell Biology, University of Connecticut, Storrs, CT, USA;3. Malaria Vaccine Branch, Walter Reed Army Institute of Research, Silver Spring, Maryland, MD, USA;4. Center for Cellular Imaging and Nano Analytics (C-CINA), Biozentrum, University of Basel, Mattenstrasse 26, Basel, Switzerland |
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| Abstract: | In addition to understanding the various meanings attached to the word “pressure” one also has to comprehend the meanings of the phrases in which the term “pressure” appears. For instance one comes across the following combinations: “static-fluid pressure”, “thermodynamic pressure”, “mechanical pressure”, “contact pressure”, “stagnation pressure”, “vapor pressure”, “electro-osmotic pressure”, etc., One also often comes across the comment that “pressure is the Lagrange multiplier that enforces the constraint of incompressibility” and that “pressure is the mean normal stress”. In general the word “pressure” with different significations, is used with gay abandon without paying proper attention to its usage1. The distinction in the meanings of the above terms assumes paramount significance when discussing properties of materials, which could possibly depend on “pressure”. In this short note we discuss the distinction between various significations of the word “pressure”, and their implications with regard to response relations for bodies. |
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| Keywords: | Thermodynamic pressure Mechanical pressure Mean value of stress Contact pressure Vapor pressure Electro-osmotic pressure |
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