Place any size or shape pasta in a bowl or glass of water. Plan on measuring the water both before and after. Allow it to sit during the day and observe the changes later. What happened to the pasta? How much water is there now? Where did the water go? What will happen to the pasta is we leave it out of the water?
Get spaghetti portion measuring sticks to show kids how much is for a child, one person 2 people etc. Can cook up individual amounts.
Have cooked spaghetti and uncooked spaghetti for the children to experiment with. Have them think about why, and how it is different. Use their five senses to explore all the differences and similarities.