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About Photosphere Definition Photosphere is the lowest visible layer of a star, lying beneath the chromosphere and the corona. The term itself is derived from…

Pituitary Gland Definition Pituitary gland is a pea-sized gland located in the center of the skull, inferior to the hypothalamus of the brain and posterior…

Hydroxide Definition Hydroxide is a chemical compound containing one or more hydroxyl radicals (OH). The positively charged portion of the compound usually is the ion…

Chromosphere Definition Chromosphere is a glowing, transparent layer of gas surrounding the photosphere of a star. The Sun’s chromosphere is several thousand kilometers thick, is…

Neuroanatomy Definition Neuroanatomy is the branch of anatomy that deals with the nervous system. It is the neural structure of an organ or a part.…

About Nervous System Definition The nervous system of vertebrates is a complex information-processing system that consists mainly of the brain, spinal cord, and peripheral and…

Polyatomic Ion Definition Polyatomic ion is an ion comprised of two or more atoms. It also known as a molecular ion, which is a charged…

Ionization Definition Ionization is when an atom becomes an ion, by either gaining or losing electron. Unstable do atoms of an element become when ionized.…

Hypothalamus Definition Hypothalamus is a small but important part of the brain and plays an important role in hormone production and helps to stimulate many…

Uses of Ethanol Introduction Ethanol is an alcohol obtained from the fermentation of sugars and starches or by chemical synthesis. It is the intoxicating ingredient…

Mesosphere Definition Mesosphere is the region of the Earth’s atmosphere lying above the stratosphere and below the thermosphere, from a height of about 50 km…

Petrochemistry Definition Petrochemistry is the branch of chemistry dealing with petroleum or its products. It focuses on how crude oil and natural gas are transformed…