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Because of our coefficient of thermal expansion which is low. So they don't perturb the measure (or little). They have furthermore a CTE. That of Fused silica is around 0.5/0.6 µm/m.K. For measuring the low CTE of a material, it is necessary to make a first measure on an etalon sample of fused silica in goal of know the elongation of the sample holder.
I'm not sure of my english but I hope I've answered to your question. Bye
Gabriel
What else can I help you with?
How can you melt fused silica?
Fused silica has 2 meanings: previously fused silica and presently fused silica. Previously fused silica is fused by heating it to its melting point. This can be done in crucible in a furnace. Presently fused silica is already hot and fused. Note: melted silica is probably a conductor, at least melted glass is a conductor.
What is the difference between quartz and fused silica?
Fused silica is an engineering-quality, amorphous version of quartz. Source: http://www.makeitfrom.com/material-data/?for=Fused-Silica-Fused-Quartz
What is a composition of fluxes and silica fused to make glass?
Frit
Is silicon carbide equivalent to fused silica sand in foundries?
Silicon carbide is certainly not chemically equivalent to fused silica sand, because the carbide contains no oxygen and the sand contains no carbon.
What is the density of silica?
The density of quartz is around 2.6, meaning that it weighs 2.6 times as much as an equal volume of water.
How is silica a non renewable resource?
No.
Why is glass better than fused silica as prism construction?
Fused silica is used for ultraviolet radiation. For the visible spectrum some types of glasses are more dispersive - this means that the refractive index is more dependent on the wavelength of a radiation.
What has the author Dan Nir written?
Dan Nir has written: 'Mechanical protection of DLC films on fused silica slides' -- subject(s): Testing, Optical materials
What is a composition of fluxes and silica fused at high temperatures to make glass called?
That composition is called a glass batch. It typically consists of raw materials such as sand (silica), soda ash, limestone, and other additives that are melted together at high temperatures to produce glass.
Why are cuvettes that are used in the 200-400nm range made of silica?
A cuvette is a very small tube that is sealed at one end and made of plastic, glass, or fused quartz. The reason why the cuvettes that are used in the 200-400 nm range are made of silica is because of the shifts in the chemical equilibria.
What materials did they use for roman glass?
The Romans fused silica, the main component of the local sand, and soda by heating them. The silica is the main component of quartz and non- tropical sand. The soda they used was nitron, a salt which was found on dry lake beds. The main source of this salt was Egypt. The Romans also used lime as a stabiliser.
Aerogel is how many times less dense than glass?
Aerogels are a diverse class of materials which can be composed of many different substances. The lowest density aerogels that have ever been produced were silica aerogels about 0.0011 g/cm3 in density, making them about 2002 times lower density than fused silica, a high-purity form of glass which has a density of 2.203 g/cm3. This is the most useful direct comparison since the composition of silica aerogels and fused silica are the most alike. In comparison to common soda-lime glass, which contains elements other than silicon, oxygen, and hydrogen and has a density of about 2.52 g/cm3, these ultralow density aerogels are 2291 times lower density. Typically, silica aerogels and non-silica aerogels range from about 0.01 g/cm3 to 0.5 g/cm3 in density, so a useful range to report would be "between 5 to 250 times lower in density than common soda-lime glass, and as low as 2290 times for the lightest aerogels ever produced".
