Pressure, stress, or elastic modulus: Force per unit area. Fundamental quantity in mechanics, fluid mechanics, and geotechnical engineering. Common units include pascal (Pa), kilopascal (kPa), megapascal (MPa), pound per square inch (psi), kip per square inch (ksi), bar, atmosphere (atm), kilogram-force per square centimetre (kgf/cm²), and millimetre of mercury (mmHg).
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