Geometric mean diameter
a measure of the central tendency of particle size composition of substrate materials sometimes used as an index of the quality of spawning gravels. Also referred to as D50 size.
Dictionary > Geometric mean diameter
You will also like...

Meiosis – The Genetics of Reproduction
Meiosis is a form of cell division that creates gametes. It is comprised of two divisions that in the end, the resulting..

Control of Body Movement
Some of the body movements can be controlled at will, others cannot. The body has a motor program, which is the pattern ..

The Gene Pool and Population Genetics
According to Charles Darwin's theory of natural selection, preferable genes are favored by nature in the gene pool, and ..

Growth and Plant Hormones
Plants, like animals, produce hormones to regulate plant activities, including growth. They need these hormones to respo..

Human Reproduction
Humans are capable of only one mode of reproduction, i.e. sexual reproduction. Haploid sex cells (gametes) are produced ..

IQ, Creativity and Learning
Human intelligence provided the means to utilize abstract ideas and implement reasoning. This tutorial takes a further l..