Density - Encyclopedia.com
2018年5月23日 · density 1. A measure of the amount of information in a given dimension of a storage medium. The density of information on a disk is almost always a fixed number of bits per sector, sectors per track, and tracks per disk. For magnetic tape it is the amount of information recorded per unit length of tape, usually in bits per inch or bits per ...
Buoyancy - Encyclopedia.com
2018年5月14日 · Since density is equal to mass divided by volume, this means that volume multiplied by density is the same as mass. We have established that the weight of the fluid "bag" is Vdg, where V is volume, d is density, and g is the acceleration due to gravity. Now imagine that the "bag" has been replaced by a solid object of exactly the same size.
Praseodymium | Encyclopedia.com
2018年6月11日 · Praseodymium. melting point: 935 ° C boiling point: 3,017 ° C density: 6.475 g/cm 3 most common ions: Pr 3+, Pr 4+. In 1885 C. A. von Welsbach isolated two elements as oxides, praseodymium (the word meaning "green twin") and neodymium (meaning "new twin"), from a mixture of lanthanide oxides called didymia.
Pumice - Encyclopedia.com
2018年5月29日 · The term vesicular refers to the presence of vesicles, or irregularly shaped cavities, that produce a sponge-like or bubbly texture and very low density in volcanic rocks. Pumice can be thought of as a volcanic foam that forms when dissolved gases expand rapidly as magma rises towards the surface and confining pressure decreases.
Mass, Density, and Volume | Encyclopedia.com
The density of gold is 19 g/cm 3, and because density is equal to mass divided by volume, the volume of water displaced should be equal to the mass divided by the density. The latter figure is equal to 10 g divided by 19 g/cm 3 , or 0.53 ml. Suppose that …
density-independent factor | Encyclopedia.com
density-independent factor Any factor limiting the size of a population whose effect is not dependent on the number of individuals in the population. An example of such a factor is an earthquake, which will kill all members of the population …
Carbon Tetrachloride - Encyclopedia.com
2018年5月11日 · Carbon tetrachloride (CAR-bun tet-ra-KLOR-ide) is a colorless, nonflammable liquid with a sweetish odor and a density 1.5 times that of water. The compound is classified as a halogenated hydrocarbon because all of the hydrogens in methane (CH 4), a hydrocarbon, have been replaced by halogen atoms (chlorine, in this case).
Density Current - Encyclopedia.com
2018年5月8日 · density current A current that is produced by differences in density. Where a flow of sea water has a greater density than that surrounding it, the denser water will dive beneath the less dense water. The density of sea water is affected by temperature, salinity, and the content of suspended sediment. Most deep and bottom ocean currents are ...
Citric Acid - Encyclopedia.com
2018年5月21日 · Its density is about 1, 665 kg/m 3 and is soluble in water at around 133 g/100 ml (at 68 ° F [20 ° C]). Citric acid has a melting point of about 307 ° F (153 ° C) and a boiling point of approximately 347 ° F (175 ° C). It is produced commercially by the fermentation of sugar by several species of mold.
Niobium | Encyclopedia.com
2018年5月29日 · melting point: 2,475 ° C ± 10 ° C boiling point: ∼ 4,740 ° C density: 8.57g/cm 3 at room temperature most common ions: Nb 3+ Niobium metal is typically gray or dull silver in color. It is one of the refractory metals along with tantalum, tungsten, molybdenum, and rhenium, due to its very high melting point .