Overall, in scientific contexts the word "medium" refers to a substance or material in which something exists or grows or through which something can move or otherwise travel. The word "medium" and its plural, "media," can have multiple applications in various areas of science, from the soils and other materials for plant growth (growing media) in agriculture to the material that is used to grow bacteria in a biology lab setting (culture media). The word may also appear in certain physics settings, such as an excitable medium or an active laser medium, or in astronomy, such as the interplanetary medium that exists alongside planets in the solar system and the interstellar medium that exists between stars in outer space.Know More
In horticultural contexts, the term "growing medium" can be used to refer to things as simple as soil, or the soil blends that are used as ideal settings for seeds to germinate and plants to flourish. This medium is intended to support and provide nutrients to the plant in addition to facilitating root growth.
In biological contexts, culture media are used in experimental settings in order to grow samples of bacteria, or cultures, for observation and research. Agar is a commonly used culture medium thanks to its solidity and its resistance to degradation.Learn more about Science
There is a direct relationship between absorbance and concentration is the higher the absorbance of a substance, the more concentrated its solution will be in water or another medium. In chemistry, this is a principle known as the Beer-Lambert Law.Full Answer >
In science, if something isn't directly observable it can't be "discovered." There is only indirect evidence of black holes. The existence of black holes has been a topic of speculation for hundreds of years, but John Wheeler is credited with coining the term, "black hole," in 1969.Full Answer >
In science, neutral means one of three things: something that is gray and without hue or zero chroma; something that does not have a charge and is not magnetized; or something that does not exhibit acid or alkaline qualities. Neutral has many meanings outside of science as well and can mean belong to a neutral state or party and not taking part or giving assistance during a dispute or war between others.Full Answer >
According to the Encyclopedia Britannica, in terms of classical theory, electromagnetic radiation refers to energy that flows at the universal speed of light via free space or a material medium in the form of electric and magnetic fields that comprise electromagnetic waves, such as radio waves, gamma rays and visible light. Electromagnetic waves are characterized by their intensity and the frequency of the electric and magnetic field's time variation.Full Answer >