Thursday, August 18, 2011

Bubble Magic and Teddy Bear Molecules

We're going to find the best bubble recipes, and a really easy way to explain surface tension!




What better way is there to learn about surface tension and water molecules than by playing with bubbles? Kat and I have been having a lot of fun exploring the different ways that liquids interact with each other, and the reactions that can take place. This time, we decided to explore surface tension by learning about how bubbles work! Even better, we've taken our lesson to the park and have invited the other kids to come along and learn with us!

The first thing we had to do was talk about surface tension. We've played around with the surface tension of various liquids before, but we still didn't quite understand what it actually meant. After trying several different explanations, we came up with a fantastic way to illustrate it.

Friday, August 5, 2011

Fun Lessons in Density and Properties of Matter!

This week, Kat and I have been studying the various stages of matter! Today, we focused primarily on properties of matter, and ways that you can distinguish between them.

We began by asking the question, what is density? Density is a measurement of mass, or the relative heaviness of an object with a constant volume. Simply put, density is a measure of how much "stuff" is in something. That "stuff" pertains to atoms and molecules, which make up the mass of an object. For example, in a liquid, the molecules are loosely "hanging out". Kat and I demonstrate this by clasping our hands closely together, and wiggling our fingers around to demonstrate the "hanging out" of liquid molecules. Some liquids are denser than others, which means that their atoms are "hanging out" closer together, they're more tightly packed, but not quite as tightly packed as they are in a solid. Things that are really dense, are generally heavier than those that are not.