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ConversionsLength1 inch = 2.54 centimeters (exactly)1 centimeter = 0.394 inches 1 foot = 0.305 meters 1 mile = 5280 feet = 1.61 kilometers 1 kilometer = 1000 meters = 0.621 miles 1 light year = 9.46 x 10^12 kilometers = 5.88 X 10^12 miles = 0.307 parsec Area1 square inch = 0.00694 square feet = 6.45 square centimeters1 square foot = 144 square inches = 0.0929 square meters 1 square mile = 640 acres = 2.59 square kilometers Velocity Speed1 ft/s = 0.305 m/s1 mile/hour = 1.47 ft/s = 1.61 kilometer/hour = 0.447 m/s 1 m/s = 1000 cm/s = 3.28 ft/s 1 kilometer/hour = 0.278 m/s = 0.621 miles/hour = 0.912 ft/s Speed of light = 3.00 x 10^8 m/s = 186,000 miles/second Speed of sound in air ar 0 degrees C = 331 m/s = 10909 ft/s = 741 miles/hour Force1 pound = 16 ounces = 4.45 newtons1 newton = 0.223 pounds Temperature32F = 0C = 273 KelvinPressureAir pressure at sea level = 1.01 X 10^5 newtons/square meter = 14.7 pounds/squareHeat and Work Energy1 calorie = 4.18 joules = 0.00442 BtuPower1 horsepower = 550 foot pounds/second = 746 watts1 watt = 1 joule/second = 0.239 calorie/second = 3.80 Btu/hour 1 kilowatt = 1.34 horsepower Metric Prefixes
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