Measurement
Units of Mass
Atomic Mass Unit | 1 u = 1.6605 × 10^{-27} |
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Mole (mol) | One mole is defined as the amount of substance that contains exactly as many atoms or molecules as are in precisely 12 grams of ^{12}C. units in moles = mass ( grams ) / molecular mass ( g mol^{-1} ) |
Units of Temperature
Celsius/Centigrade (C) | Absolute zero: -273.15°C T°C = ^{5}⁄_{9} ( T°F - 32 ) |
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Fahrenheit (F) | Absolute zero: -459.67°F T°F = ^{9}⁄_{5} T°C + 32 |
Kelvin (K) | Kelvin and Centigrade have equal increments. The difference between Kelvin and Centigrade is that 0°K is absolute zero (-273.15°C) and 0°C is the freezing point of water (273.15°K). Thus, ΔT in °K and °C will be equal, even though T°F ≠ T°C. Absolute zero: 0°K |
Units of Pressure
Pascals (Pa) | N/m^{2} | 1 Pascal = 7.50247 · 10^{-3} mm-Hg 1 Pascal = 9.86923 · 10^{-6} atm 1 Pascal = 10^{-5} Bar 1 Pascal = 1.45037738 · 10^{-4} PSI |
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Torr | mm-Hg | 1 Torr = 133.289437 Pascal |
Atm | 1 atm = 1.01325 · 10^{5} Pascal 1 atm = 760.0 mm-Hg | |
Bar | 1 Bar = 10^{5} Pascal | |
PSI | lbs in^{-2} | 1 PSI = 6894.75729 Pascal |
Units of Heat and Energy
Joule (J) | |
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calorie (cal) | 1 calorie = 4.186 J |
Calorie (Cal) | 1 Calorie = 4.186 kJ = 1000 cal = 1 kcal = 4186 J |