According to the inquiry of Sina Education, soybeans are large and small. Large soybeans are kidney-shaped, about 0.5 cm long, with a long axis of about 6 to 8 mm. Small soybeans are spherical or ellipsoidal, with a diameter of about 3 to 5 mm. The weight of soybeans can be called 100, divided by 100. The 100-seed weight of soybean is between 15-25g. An average soybean weighs about 0.2g.