Will the motion of particles always increase with the rise of temperature? I came across this following question while poring over my textbook.


  Predict the change in the motion of particles you would expect in the following if the temperature was increased:
  a) Solid
  b) Liquid


I think if the temperature increases, solid or even liquid particles will receive more energy and therefore their motion will speed up. I'm not sure why there are two parts for this question. Aren't they supposed to be similar?

Thank you so much for helping! Since this is my first post, please pardon me if I accidentally violate any rules of the forum.
Indeed they are similar, but there is a difference. For solids, particles can only vibrate about their own position. Heating results in a stronger vibration. For liquids, particles can wander around the whole volume of the liquid. Heating increases the speed of the particles so that they can move more quickly inside the liquid, hence a higher diffusion constant.