A mug of boiling-hot water sits next to a glass of water. How does the movement of water molecules change in each case?
Answers (1)
Since the mug sits next to the glass, the movement of water molecules in the mug can affect that in the glass indirectly. I can describe it this way:
The glass become hotter in two ways: first, the heat from the mug radiates directly to the glass, and second, the air surrounding the mug gives it warm to the glass. So, in these two ways, glass become hotter and hotter, and in consequence the water inside the glass also become hotter and hotter. Finally, water molecules in the glass will move faster. You see, the movement of boiling-hot water in the mug indirectly causes the movement of water in the glass sits next to it.