I just wanted to know the answer to this because of the idea of phases of matter, would a paste (or glue) drying count as a change between the states of solid and liquid?

  • $\begingroup$ Beware not to confuse element with compound though! And by the way... how would you call nutella? solid or liquid? $\endgroup$ – Pietro Oliva Jan 15 '19 at 23:03
  • $\begingroup$ It's a very good question! What could you study about the physics of a glue? $\endgroup$ – Sam Cottle Jan 15 '19 at 23:05
  • $\begingroup$ the glue normally works via adhesion mechanical or dispersive... whether you call something solid or liquid i think is a matter of timescale. $\endgroup$ – Pietro Oliva Jan 15 '19 at 23:10
  • $\begingroup$ @PietroOliva, Nutella is a somewhat complicated mixture of things. I'm guessing that it probably is a colloidal suspension of various fine, solid-like particles in a solution of liquid-y ingredients. $\endgroup$ – Solomon Slow Jan 15 '19 at 23:16

When paste or glue "dries" it is actually undergoing a chemical reaction so this is not a phase transition as in the phases matter. Many chemical reactions may start with compounds in one state that change to another; examples are fire, precipitates in solution, cement etc....

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