Basic Units of Measurement and Conversions - Basic Mathematics for Water and Wastewater Operators - page 57

TABLE 2.6 (continued)
Alphabetical List of Conversion Factors

Factor Metric (SI) or English Conversions

1 rad 100 ergs/g (ergs/gram)

0.01 Gy (gray)
1 rem, unless modified through division by an
appropriate factor, such as Q or N

1 rem 1 rad, unless modified through division by an

appropriate factor, such as Q or N

1 Sv (sievert) 1 Gy, unless modified through division by an

appropriate factor, such as Q or N

1 torr 1.33 mb (millibar)

1 W (watt) 3.41 Btu/hr (British thermal units/hour)

1.341 × 10 -3 hp (horsepower)
52.18 J/sec (joules/second)

1 wk (week) 7 days

168 hr (hours)
10,080 min (minutes)
6.048 × 10 5 sec (seconds)
0.0192 yr (year)

1 Wh (watt-hour) 3.412 Btu (British thermal units)

859.8 cal (calories)
3600 J (joules)
35.53 L-atm (liter-atmospheres)

1 yd 3 (cubic yard) 201.97 gal (gallons)

764.55 L (liters)

1 yr (year) 365.25 day

8766 hr (hour)
5.26 × 10 5 min (minute)
3.16 × 10 7 sec (second)
52.18 wk (week)

Problem: How many cubic feet of biosolids are removed when 14,000 gal are
withdrawn?

Solution :

Cubic feet = 14,000 gal ÷ 7.48 gal/ft 3 = 1871.66 ft 3

■ Example 2.113
Convert gallons to pounds.

Pounds (lb) = Gallons × 8.34 lb/gal