Radioactivity is caused by emission of high energy radiation from unstable atomic nuclei. An atomic nucleus will be unstable if it has an excess of energy caused by an excess of either neutrons or protons. The nucleus will decay into a more stable atom (usually a different element) from the parent atom. ©Wikipedia An atom … Continue reading The Cause of Radioactivity
Meteorites are the remains of space rocks that have fallen to Earths surface (a space rock still in space is termed a meteoroid , and when it is plunging through Earths atmosphere it is termed a meteor) . The small number of meteorites that survive vaporization in the atmosphere relatively intact give a picture of … Continue reading Chemical Composition Of Meteorites
Carbon nanotubes are tubes made of carbon with diameters typically measured in nanometers. Carbon nanotubes often refer to single-wall carbon nanotubes (SWCNTs) with diameters in the range of a nanometer. Single-wall carbon nanotubes are one of the allotropes of carbon, intermediate between fullerene cages and flat graphene. Although not made this way, single-wall carbon nanotubes … Continue reading Carbon Nanotubes
Liquid crystals (LCs) are a state of matter which has properties between those of conventional liquids and those of solid crystals. For instance, a liquid crystal may flow like a liquid, but its molecules may be oriented in a crystal-like way. There are many different types of liquid-crystal phases, which can be distinguished by their … Continue reading Liquid Crystals
Fireworks are a class of low explosive pyrotechnic devices used for aesthetic and entertainment purposes. The most common use of a firework is as part of a fireworks, a display of the effects produced by firework devices. Fireworks take many forms to produce the four primary effects: noise, light, smoke, as well as floating materials. Colors in fireworks are … Continue reading Chemistry compounds responsible for firework color
Collision theory states that when suitable particles of the reactant hit each other with correct orientation, only a certain amount of collisions result in a perceptible or notable change; these successful changes are called successful collisions. ©Socratic Collision theory was proposed independently by Max Trautz in 1916 and William Lewis in 1918. Consider the bimolecular elementary reaction: A + B → … Continue reading Collision theory
Uranium glass is glass which has had uranium, usually in oxide diuranate form, added to a glass mix before melting for colouration. The proportion usually varies from trace levels to about 2% percent uranium by weight, although some 20th-century pieces were made with up to 25% uranium. Having been first identified in 1789 by a … Continue reading Uranium Glass
Kinetic theory of gases is a simple, historically significant classical model of the thermodynamic behavior of gases, with which many principal concepts of thermodynamics were established. The model describes a gas as a large number of identical submicroscopic particles (atoms or molecules), all of which are in constant, rapid, random motion. Their size is assumed … Continue reading Kinetic Theory of Gases
Hydrocarbon is an organic compound consisting entirely of hydrogen and carbon. Hydrocarbons are generally colourless and hydrophobic with only weak odours. Because of their diverse molecular structures, it is difficult to generalize further. Hydrocarbons are generally of low toxicity, hence the widespread use of gasoline and related volatile products. Aromatic compounds such as benzene are … Continue reading Hydrocarbon
Fullerene is an allotrope of carbon whose molecule consists of carbon atoms connected by single and double bonds so as to form a closed or partially closed mesh, with fused rings of five to seven atoms. The molecule may be a hollow sphere, ellipsoid, tube, or many other shapes and sizes. Since each carbon atom … Continue reading Fullerene
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