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  • It is possible due to the surface tension. On applying heat, the glass starts to melt and takes a rounded shape at edges having minimum surface area. This is known as the fire polishing of glass.

Explain the term ‘laminar flow’. Is the velocity of molecules the same in all the layers in laminar flow? Explain your answer.

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Laminar flow can also be defined as the flow in which there is a regular gradation of velocity in passing from one layer to the next.

When a liquid flows over a fixed surface, it comes in contact with it. The layer of molecules in the immediate contact of the surface is stationary. As the distance of layers increases from the fixed layer, the velocity of the upper layer also increases.

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