Crystal is defined legally by a UK British Standard BS 3828 of 1973 and the EU Crystal Glass products directive 69/493 EEC of the 19th March 2002, Gazette No 24700 . The Refractive Index by UK and EU law, must be not less than 1.520, and the density must be of at least 2.54 g/cm2. If lead is present, to be called "Crystal Glass" it must contain 10% at least of zinc, barium, or potash, alone, or together. (In the USA, only 1% is needed, which would easily be considered just plain glass by the UK.) Only Lead crystal, ( or Full Lead Crystal with over 30% lead) contains lead or other materials which modify the characteristics of the material. The same is true for other types of glass where the refractive index is changed by inclusion of other materials to make camera lenses etc. "Lead crystal" was a British invention discovered by George Ravenscroft and registered on the 16th May 1667, and financed by the Worshipful Company of Glass Sellers of London.
The addition of up to 30% lead oxide, ( though most manufacturers are reducing it to 24%, the legal minimum to be called lead crystal ), gives crystal glass a high index of refraction which makes it sparkle when cut at sharp angles, is softer to cut, and gives the glass a distinctive long lasting ringing tone when it is struck gently with a hard object like a fingernail. The lead may under very extreme conditions leach out into acidic beverages, like white wine or Orange Juice ( if stored over night in a fridge for instance). The glass is also more fragile and subject to temperature shock: Crystal glass will often break when cold water is poured into a hot glass or vice versa.
Glass is a liquid in the sense that it does indeed flow, but it flows over an extensive period of time. The difference between a crystal and glass, is that a crystal has a homogenous solid formed by a repeating, three-dimensional pattern of atoms, ions, or molecules and having fixed distances between constituent parts. Glass on the other hand, has molecules that are disordered but are rigidly bound.
Gear oil is more viscous (thicker) and has different additives in it.
Acid lava comes from composite cones,is slowly moving and viscous while basic lava comes from shield volcanoes,is non viscous, runny and flows faster
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There is hydrogen bonding between H2SO4 molecules. Hence it has a associatedstructureand due to this H2SO4 is viscous.
The more viscous the liquid (higher the viscosity), the lower flow rate you will have for a given "pipe" and pressure difference.
Viscosity is the thickness of a substance; how easily it flows. Molasses> very viscous Water-> not so viscous
The difference is that,an oil is a dark viscous liquid with high density and low rate of diffusion why gas is a well pronounce substance with low density and rate of diffusion. The difference is that,an oil is a dark viscous liquid with high density and low rate of diffusion why gas is a well pronounce substance with low density and rate of diffusion.
Viscous lava is very sticky and thick and is more felsic (ie it contains more silica) than non-viscous lava. This type of lava makes for a very explosive volcano, because it's so sticky that it sticks to itself and can't exit the volcano until it explodes violently. Non-viscous lava is more runny and is more mafic (has more iron, less silica). Volcanoes with non-viscous lava are less explosive because the lava just runs out slowly and no pressure builds. The Hawaiian islands are formed from volcanoes with non-viscous lava.
Iodine is a solid crystal, and is not viscous. It may be dissolved in alcohol, and viscosity will vary based on the solution made. If the crystal is heated to extremely high temperatures it will become a vapor, which can have its viscosity measured.
The more viscous the liquid (higher the viscosity), the more time it takes to flow through a hole, given a the same pressure difference.
dynamic viscosity is the quantitative expression of fluid's resistance,while kinematic viscosity is the ratio of fluid viscous force to inertial force.