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One kilogram is equal to a weight represented by one liter of distilled water at 4 degrees C. One inch = 2.5 centimeters nearly; one quart (wine measure) = 0.946 liter; one pound Troy 0.373 kilogram; one acre 0.4046 hectare.

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To reduce (approximately) grains to grams, divide by 10 and from the quotient subtract one-third of itself; to reduce drachms to grams, multiply by 4; to reduce ounces to grams, multiply by 32.

To convert degrees of one thermometer scale into those of another. Fahr. into Cent.Divide by 9, multiply by 5 and deduct 32; Cent. into Fahr.-Multiply by 9, divide by 5 and dd 32.

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