PHYSICS DICTIONARY

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Viscosity

 It is the property of a fluid which opposes the relative motion between its layers. Viscosity is known as fluid friction.

Visible Spectrum

 Molecular spectrum obtained in visible or ultraviolet region.

Vitrification

 During firing of a ceramic body, the formation of a liquid phase that upon cooling, becomes a glass bonding matrix.

VME

VME stands for Versa Module Europa. It was jointly introduced in 1981 by Mostek, Motorola, Phillips, and Thompson. The original motivation of VME development and standardization was to introduce modular approach to highly intense computing tasks. However it was quickly adopted by researchers in other fields as well, so much that it now probably stands as the most used system in research laboratories. Due to its flexibility and expandability, it has received its fair share of popularity in industrial environments as well. The original VME standard is now referred to as VME32 as it could handle up to 32 bits of data. The new standard is called VME64 and has the capability of 64 bit data transfers.

VME Logic

VME is a TTL based system. That is, its internal functioning follows TTL logic. However modules accepting and producing other logic signals can be integrated into the system.

Volt

It is the unit used to measure electric potential difference between two points. One volt is electric potential difference between two points when one joule of work is done in carrying one coulomb of positive charge from one point to another.

Voltage

It represents electric potential energy per unit charge. It is measurement of the energy contained within an electric field, or an electric circuit, at a given point.

Volume Strain

 It is the change in volume per unit original volume or it is the fractional change in volume.

Vulcanization

Non reversible chemical reaction involving sulphur or other suitable agent where in crosslink’s are formed between molecular chains in rubber materials. The rubber’s modulus of elasticity and strength are enhanced. 

VVER

 Acronym for Voda Vodyanoi Energitechesky reactor (water cooled water moderated energy reactor)

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