Shaken bottle of water mystery

[Magical Realist]

Heat is defined as the motion of molecules. Why is then that when you shake a bottle of water it doesn't heat up? Aren't the water molecules moving?

[Image: water-bottle-537x402.jpg]

[C C]

Water molecules get vibrated or rotated a lot faster by EM radiation in microwave ovens, manipulated via their particular dipole characteristic. Manual oscillation of bulk water in a bottle isn't speedy enough to make it hot anytime soon and also possibly not quick enough to keep whatever tiny amount of heat it might generate over a period from dissipating away before the next round can join it.

[Magical Realist]

Water molecules get vibrated or rotated a lot faster by EM radiation in microwave ovens, manipulated via their particular dipole characteristic. Manual oscillation of bulk water in a bottle isn't speedy enough to make it hot anytime soon and also possibly not quick enough to keep whatever tiny amount of heat it might generate over a period from dissipating away before the next round can join it.

I'm thinking the water of the shaken bottle moves the molecules around in clumps or cells that don't translate into the actual movement of the molecules themselves. We already know water clumps up in droplets. Perhaps this same ionic clumping is going on in the water itself. Not sure though..

[Mr Doodlebug]

Some of the energy would go into movement, and some of the movement would cause friction.
The bottle would heat up very slightly.
If you are churning milk, the milk does get warm.