You could explain the concept of full - empty to a toddler by following ways:
- Show the child any water bottle that is filled and another that is empty.
- Also, ask her to notice that the full bottle is heavier than the empty one.
- Ask the toddler to transfer contents(like dal ) from one glass to another, once she transfers to the second glass, tell her that the first one has become empty
- You could also refer to this activity to demonstrate an empty glass.