# Air has Weight

This experiment comes from a question sent to me a homeschooling mom named Elaine. It is based on a "classic" experiment often seen in textbooks to show that air has weight. While it starts simple, it takes some twists along the way that often cause people to misunderstand what is actually happening.

# A Cool Experiment

This experiment is one that you can try the next time you take a bath. Have you ever noticed that you feel cold after a hot bath? Actually, there is more than one reason that you could feel chilled when you get out of the tub. If the water was very warm, then the air will feel cooler by comparison, but even if the water was cool and the air was warm, you could still feel a chill.

# Crushed Can

This experiment is a classic demonstration of air pressure that also shows how drastically matter changes as it moves from one state to another.

# Air Space

There are only two more days before we head for New Zealand. I am looking forward to the farm, the beach, seeing friends, and the food. It will be a LONG flight, but I am even looking forward to that. Most of my packing is done, and I am down to the "what did I forget" stage.

# A Model of the Water Cycle

The Water Cycle is one of the major topics students are expected to understand in science. This is because water is such an important resource for food production, industry, and daily life. To help understand how the water cycle works, lets make a working model, using some common, household items.

# Building a Rain Gauge, part 2

Back to part 1

### What Does a Rain Gauge Really Tell Us?

Now that we know the proper shape and location for a rain gauge, lets take a look at what they can tell us, and why they are important.

Lets start by imagining that you put a rain gauge in your yard. After a rain, you find that there is one inch of rain in your rain gauge. We can use that to calculate how much rain fell on your yard.