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Unit Converter Basic Free units conversion software for pressure, power, energy, magnetic induction, dynamic & kinematic viscosity, luminance, temperature, mass, volume, length & time.
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Sitzing Tools Online calculators for precision motions, motors controllers, tolerances, vibrations, heat transfer, actuators, springs, screws, reliability, shafts, sytems and a few more.
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Dirac Delta Huge compendium of online calculators related to aerodynamics, acoustics, civil engineering, electronics, mathematics, mechanical engineering, vibration, optics, physics & signal processing. Besides the online calculators it also serves as an encylopedia on the listed topics.
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efunda comprehensive suite of Online calculators and under continous expansion. The following are the types of calculators - Units Conversion, Wire and Sheet Gauge, O-Ring, Spring, Hardness, Decimal, Beam, Reynolds Number, Single Degree of Freedom Vibration, Stress Transformation, Principal Stress, Failure Criteria, Pipe Friction, Venturi Flow, Radiation and Elastic Constants. Other calculators available are for Pure Mathematics and Finance.