Physicist Jan Baptista Van Helmont began to observe the growth of a willow tree and made various measurements for it. He first weighed the tree, then 5 years later he weighed the same tree again for the second time, finally
Physicist Jan Baptista Van Helmont began to observe the growth of a willow tree and made various measurements for it. He first weighed the tree, then 5 years later he weighed the same tree again for the second time, finally