How viscous must a liquid be to classed as a solid?

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Michael Dawson

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Michael Dawson  asked the Naked Scientists:
   
Hi Chris,

I was taught at school that matter has three states, gas, liquid and solid.  However someone said that window glass was the ultimate viscous liquid. 

Whether this is true  I don't know.  But my question is how viscous has a liquid to be before it is classified as a solid?

Mike

What do you think?
« Last Edit: 15/05/2010 19:30:03 by _system »

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Offline sithcdw

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How viscous must a liquid be to classed as a solid?
« Reply #1 on: 19/05/2010 04:24:42 »
Viscosity is a fluids resistance to flow. Therefore, if the substance does not "flow", it should be classified as a solid.

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Offline sithcdw

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How viscous must a liquid be to classed as a solid?
« Reply #2 on: 19/05/2010 04:27:23 »
Now the reason that glass is sometimes called a liquid is because the molecules within it have not crystallized.