Basic Units of Measurement and Conversions - Basic Mathematics for Water and Wastewater Operators - page 61

TABLE 2.7 (continued)
Conversion Factors by Unit Category

Factor Metric (SI) or English Conversions

Units of the Measure of Temperature

°C (5/9)[(°F) - 32°]

1°C (expressed as an interval) 33.8°F = (9/5)(°F)

1.8°R (degrees Rankine)
1.0 K (degree Kelvin)

°F Fahrenheit) (9/5)[(°C) + 32°]

1°F (expressed as an interval) 0.556°C = (5/9)°C

1.0°R (degree Rankine)
0.556 K (degree Kelvin)
Units of Force

1 dyne 1 × 10 -5 N (newton)

1 N (newton)

1 × 10 5 dyne

Units of Work or Energy

1 Btu (British thermal unit) 252 cal (calories)

1055.06 J (joules)
10.41 L-atm (liter-atmospheres)
0.293 Wh (watt-hour)

1 cal (calorie)

3.97 × 10 -3 Btu (British thermal unit)
4.18 J (joules)
0.0413 L-atm (liter-atmosphere)
1.163 × 10 -3 Wh (watt-hour)

1 eV (electron volt)

1.602 × 10 -12 erg
1.602 × 10 -19 J (joule)

1 erg 1 dyne-centimeter

1 × 10 -7 J (joule)
2.78 × 10 -11 Wh (watt-hour)

1 J (joule)

9.48 × 10 -4 Btus (British thermal unit)
0.239 cal (calorie)
10,000,000 ergs = 1 × 10 7 ergs
9.87 × 10 -3 L-atm (liter-atmosphere)
1.00 N-m (newton-meter)

1 kcal (kilocalorie) 3.97 Btu (British thermal unit)

1000 cal (calories)
4186.8 J (joules)

1 kWh (kilowatt-hour) 3412.14 Btu (British thermal units)

3.6 × 10 6 J (joules)
859.8 kcal (kilocalories)