A, the density of the human body is approximately equal to the density of water. A middle school student weighs about 50 kilograms, 1 kg of water is the volume of 1 liter, and 1 liter is equal to 1 cubic decimeter, so a middle school student is about 50 cubic decimeter.

Second, the terms of volume and geometry. When the space occupied by an object is a three-dimensional space, the size of the space occupied is called the volume of the object. The international unit of volume system is cubic meters. One-dimensional space objects (such as straight lines) and two-dimensional space objects (such as squares) are all zero volumes.

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.

Volume, the size of the space occupied by an object is called the volume of the object? . The international unit of volume system is cubic meters. The volume of a solid object is a numerical value that describes the space occupied by the object in three-dimensional space. One-dimensional space objects (such as straight lines) and two-dimensional space objects (such as squares) have zero volumes in three-dimensional space. ?