Although we made it from A-Z in our Alphabet in Simple Science, I decided that I'd add some here and there.
Science Notebook Page (Click the picture to print).
To go with our Ocean Theme, we did D is for Density. I have two different science notebook pages with different levels of definition. For Xander, I mostly said density was the amount of stuff you have in a certain amount of space. As a demonstration, I showed him cotton and aquarium sand in two different bowls. There is the same mass of each, but very different volumes.
Showing me a small amount of space, and then spreading his arms to show me a large amount of space.
We also watched some YouTube videos. Xander is a big fan of Sick Science.
Egg Density Demonstration
Two glasses of water
Fill both glasses of water. Mix enough salt into one of them to complete saturate the water. Ask your little one what they think will happen if they put the egg in just the water. Try it out and observe what happens. Then ask them what they think will happen if you put the egg in the salt water. Try it out and observe what happens. Then ask why they think the egg sinks in the regular water and floats in the salt water (the egg is more dense than regular water, however, it is less dense than saturated salt water). If you're really good you can put salt water on the bottom of a glass, regular water on the top, and get the egg to float in the middle. I, however, am not good at stacking liquids.