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Crystallinity

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Coefficient of thermal expansion

Coefficient of thermal expansion The  coefficient of thermal expansion  is used: in linear  thermal expansion in area thermal expansion in  volumetric  thermal expansion These characteristics are closely related. The volumetric thermal expansion coefficient can be measured for all substances of condensed matter ( liquids  and solid state). The linear thermal expansion can only be measured in the solid state and is common in engineering applications. Thermal expansion coefficients for some common materials The expansion and contraction of material must be considered when designing large structures, when using  tape  or  chain  to measure distances for  land surveys , when designing  molds  for casting hot material, and in other engineering applications when large changes in dimension due to temperature are expected. The range for α is from 10 -7  for hard solids to 10 -3  for organic liquids. α...
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Angular frequency

Angular frequency In  physics ,  angular frequency.  ω. (also called the  angular speed ,  radial frequency , and  radian frequency)  is a measure of rotation rate. A high rate of angular frequency means something is turning very fast. The angular frequency is the  magnitude  of the vector quantity  angular velocity  which is also known as the  angular frequency vector   {\displaystyle {\vec {\omega }}} . Angular frequency is a measure of how fast an object is rotating It is useful in many areas of maths and science as it allows understanding of many properties of physical objects in our world. In  SI  units, angular frequency is measured in  radians  per  second , with dimensions t −1  since radians are dimensionless. Theory Angular freqency is often given in radians per second ( {\displaystyle t^{-1}} ) as it is easier to work with. In this way, the angular frequency is g...
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Angular velocity

Angular velocity In  physics , the  angular velocity  specifies the  angular speed  at which an object is  rotating  along with the direction in which it is rotating. It is a  vector  quantity. [1]  The  SI  unit of angular velocity is  radians per second . But it may be measured in other units as well (such as  degrees  per second, degrees per hour, etc.). When it is measured in cycles or rotations per unit time (e.g.  revolutions per minute ), it is often called the rotational velocity and its  magnitude  the  rotational speed . Angular velocity is usually represented by the symbol  omega ( Ω  or  ω ). The direction of the angular velocity vector is perpendicular to the  plane  of rotation, in a direction which is usually specified by the  right hand rule . Angular velocity describes the speed of  rotation  and the orientation of the axis...
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