First, measure the diameter and length of wood, take its radius and measure its cross-sectional area. (3. 14 15926 times the square of the radius of wood) and then multiply the cross-sectional area of wood by the length of wood, and the result is the volume of wood in cubic meters.

1 cubic decimeter = 1000 cubic centimeter = 100000 cubic millimeter = 1 liter = 1000 ml =0.06 1 cubic inch.

1 cm3 = 1000 cm3 = 1 ml =0.00006 1 cubic inch.

1 m3 = 1000 cubic decimeter = 1000000 cubic centimeter = 10000000 cubic millimeter =0.353 cubic foot = 1.3079 cubic yard.

1 cubic inch =0.0 16387 cubic decimeter = 16.387 cubic centimeter = 16387 cubic millimeter.

1 cubic foot =28.3 cubic decimeter = 28,300 cubic centimeters = 28,300,000 cubic millimeters.

1 cubic yard =27 cubic feet =0.7646 cubic meter = 164.6 cubic decimeter = 164600 cubic centimeter = 164600000 cubic millimeter.

1 cubic foot = 3 1. 143 bushels (English) = 32. 143 bushels (American).

1 gallon (American) = 0.0054 1 18 m3 = 0.83264 1845 gallon (British).

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China, the first mathematician in the world who worked out the correct formula for calculating the volume of a sphere, was Zu Chongzhi in the Southern Dynasties, about a thousand years earlier than Europeans. He also carefully studied the art of celestial arithmetic (astronomical mathematics) and refined the calendar of the Ming Dynasty. After his repeated requests, it was officially promulgated on 5 10. He also made bronze sundials (an instrument for measuring the time from the shadow of the sun), clepsydra and other precision observation instruments, which were adopted by later generations.

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