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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 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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Momentum

Momentum Momentum can be considered the "power" when an object is moving, meaning how much force it can have on another object. For example, a bowling ball (large mass) pushed very slowly (low velocity) can hit a glass door and not break it, while a baseball (small mass) can be thrown fast (high velocity) and break the same window. The baseball has a larger momentum than the bowling ball. Because momentum is the product of the mass and the velocity of an object, that both mass and velocity affect the momentum of an object. As shown, an object with a large mass and low velocity can have the same momentum as an object with a small mass and large velocity. A bullet is another example where the momentum is very-very high, due to the extraordinary velocity. Another beautiful example where very low-velocities cause greater momentum is the push of Indian subcontinent towards the rest of Asia, causing serious damages, such as earth quakes in the portions of himalayas. In this ex...
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