Materials


In addition to the prestige of winning an event at the Olympics, the victor receives a gold medal. At one time, Olympic gold medals were real solid gold. However, the last time a solid gold medal was awarded was at the 1912 Stockholm Olympics. Modern Olympic gold medals are sterling […]

Are Olympic Gold Medals Real Gold?


A resistor has high electrical resistance while a conductor has high conductivity. (Nicolas Thomas)
This is a table of the electrical resistivity and electrical conductivity of several materials. Included are metals, elements, water, and insulators. Electrical resistivity, represented by the Greek letter ρ (rho), is a measure of how strongly a material opposes the flow of electric current. The lower the resistivity, the more readily the […]

Table of Electrical Resistivity and Conductivity




Add highlighter ink to make water glow under a black light or phosphorescent powder to really make glowing water.
Glowing water is useful for making spectacular fountains, “magic” potions, and for added pizazz for a party or science project. Chemicals to Make Water Glow in the Dark Ordinarily, water doesn’t glow. There’s actually an exception to this. Water in a nuclear reactor does glow blue due to Cherenkov radiation. […]

How to Make Glowing Water



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DENSITY DEFINITION Density is defined as mass per unit volume. The symbol most commonly used for density is ρ (the lower case Greek letter rho). The capital letter D is also used. Density is an intensive property of matter, which means the size of a sample does not affect its value. Density commonly is expressed in […]

Density Definition in Science