To obtain Multiply Miles Feet of water@4°C Atmospheres 33.90 Horsepower-hours 198×105 Foot-pounds per min 3.3×104 horsepower ches of mercury oc Pounds per squ oules BTU 1054.8 Foot-pounds BTU per min Foot-pounds pe 2.26×10 Knots Miles per hour 0.86897624 Nautical miles Miles 0.86897624 1745×10-2 quare feet Acres 43560 BTU per Temperature factors Fahrenheit temperature 1 8(temperature in kelvins)-45967 Celsius temperature temperature in kelvins-273 15 Fahrenheit temperature 18(Celsius temperature)+ 32 Conversion of Temperatures From Tk=tc+273.15 (t+273.15)×18 Kelvin T 18+273.15 Kelvin t=Tk-273.15 Kelvin ° Farenheit Physical Constants Genera Equatorial radius of the earth= 6378.388 km 3963 34 miles(statute) Polar radius of the earth, 6356.912 km= 3949.99 miles(statute) I degree of latitude at 400=69 miles. international nautical mile= 1. 15078 miles(statute)=1852 m=6076115 ft. Mean density of the earth= 5.522 g/cm=344.7 Ib/ft Constant of gravitation (6.673+ 0.003)x 10- cm3gm-Is-2. e 2000 by CRC Press LLC© 2000 by CRC Press LLC Temperature Factors °F = 9/5 (°C) + 32 Fahrenheit temperature = 1.8 (temperature in kelvins) – 459.67 °C = 5/9 [(°F) – 32)] Celsius temperature = temperature in kelvins – 273.15 Fahrenheit temperature = 1.8 (Celsius temperature) + 32 Conversion of Temperatures Physical Constants General Equatorial radius of the earth = 6378.388 km = 3963.34 miles (statute). Polar radius of the earth, 6356.912 km = 3949.99 miles (statute). 1 degree of latitude at 40° = 69 miles. 1 international nautical mile = 1.15078 miles (statute) = 1852 m = 6076.115 ft. Mean density of the earth = 5.522 g/cm3 = 344.7 lb/ft3 Constant of gravitation (6.673 ± 0.003) ¥ 10–8 cm3 gm–1 s–2. Feet Miles 5280 Feet of water @ 4°C Atmospheres 33.90 Foot-pounds Horsepower-hours 1.98 ¥ 106 Foot-pounds Kilowatt-hours 2.655 ¥ 106 Foot-pounds per min Horsepower 3.3 ¥ 104 Horsepower Foot-pounds per sec 1.818 ¥ 10–3 Inches of mercury @ 0°C Pounds per square inch 2.036 Joules BTU 1054.8 Joules Foot-pounds 1.35582 Kilowatts BTU per min 1.758 ¥ 10–2 Kilowatts Foot-pounds per min 2.26 ¥ 10–5 Kilowatts Horsepower 0.745712 Knots Miles per hour 0.86897624 Miles Feet 1.894 ¥ 10–4 Nautical miles Miles 0.86897624 Radians Degrees 1.745 ¥ 10–2 Square feet Acres 43560 Watts BTU per min 17.5796 From To °Celsius °Fahrenheit tF = (tC ¥ 1.8) + 32 Kelvin TK = tC + 273.15 °Rankine TR = (tC + 273.15) ¥ 18 °Fahrenheit °Celsius tC = Kelvin Tk = + 273.15 °Rankine TR = tF + 459.67 Kelvin °Celsius tC = TK – 273.15 °Rankine TR = TK ¥ 1.8 °Rankine Kelvin TK = °Farenheit tF = TR – 459.67 To obtain Multiply By tF 32– 1.8 --------------- tF 32– 1.8 --------------- TR 1.8 -------