http://www.digikey.kr/ko/resources/conversion-calculators/conversion-calculator-length http://info.ee.surrey.ac.uk/Workshop/advice/index.html#psp Conversion tablesConversion tablesFromToMultiply byacreshectares0.4047arc minuteradians2.9089E-04arc secondradians4.8481E-06barspounds per square inch14.508centigradeFahrenheit9/5 then add 32.0degree of angleradians1.7453E-02electron voltsjoules1.60210..