How is the Earth like an onion? In this video from PBS Digital Studios, viewers first learn the different layers of Earth and their properties. In addition, they hear how these layers came about, starting with the Big Bang theory and the...

Help young scientists connect the dots between pressure, temperature, and volume with a video on the ideal gas law. After first reviewing the formula for this fundamental law, the instructor walks step by step through nine different...

Why does a brown cloud occur in Denver at a certain time of the year? When warm air is higher in the atmosphere, it traps cooler, denser air below and smog just sits in between them. Using bottles of colored hot and cold water, this...

Have your class explore how a hot air balloon works. Through a simple demonstration, learners can see the process up close, and discuss why this occurs. They can then perform related experiments on their own.

An informative video explains the density of particles immediately after the Big Bang, as well as the concept that whenever a particle was released, it would merge with another particle. Sal develops the concept of being able to receive...

The densities of a variety of liquids are demonstrated in this simple, yet effective experiment. Liquids such as honey, dish soap, cooking oil, water, rubbing alcohol, and corn syrup are put on top of one another in a large beaker,...

More rice grains create more friction. Pack them into a bottle and then you can use a chopstick to pick the bottle up! This is a fascinating demonstration of density and the force of friction.

A teenaged Jack Spangler demonstrates how reducing air pressure in a bottle can pull a boiled egg inside. Then dad does a similar demonstration using liquid nitrogen to reduce the air pressure. Even though the result is the same, the...

In this episode of "Steve Spangler Science" videos, the gas produced by the sublimation of carbon dioxide dry ice creates a nice, fluffy cushion in a bowl of water. Since it is less dense than a soap bubble and cool enough to keep it...

Why does a brown cloud occur in Denver at a certain time of the year? When warm air is higher in the atmosphere, it traps cooler, denser air below and smog just sits in between them. Using bottles of colored hot and cold water, this...

Here is an engaging demonstration of density that you can do with your young physical scientists. Place different rough surfaced objects into carbonated liquid. The carbon dioxide bubbles collect on the surface of the objects and...

Have your class explore how a hot air balloon works. Through a simple demonstration, learners can see the process up close, and discuss why this occurs. They can then perform related experiments on their own.

This is a strong visual display of density. It requires a mountain of materials and is quite messy, so you most likely will not want to have lab groups perform this activity. You could demonstrate it for your class when exploring the...

Learn how to make homemade lava with this short video. Casey and Rachel use household items to simulate lava in a volcano. This is a great video to teach density of liquids.

More scientifically known as granular convection. the brazil nut effect is the phenomenon in which solid granules sort themselves according to particle size when shaken. In this brief video clip, Mr. VandenHeuvel discusses where...

In this video segment, the ZOOM cast relies on the surface tension of water to make paper clips float. [2:20]

The following videos explore fundamental science concepts, explained quickly in a fun and entertaining way. Topics include density, flotation, mass, mixtures and states of matter.

Explore the science behind hot air balloons. Learn what makes them fly. Read about the history of ballooning. Engage in an interview with Steve Fossett, hot air balloon pilot. There is also a virtual flight which requires Shockwave.

Did you ever wonder why lakes don't freeze solid in the winter? In this video learn how liquid water is denser than the ice. [5:42]

Check out this cool science experiment video to see proof that carbon dioxide is heavier than air. [1:12]

This lesson will define density as mass/volume and provide relevant real world examples of objects with varying densities. It is 1 of 3 in the series titled "Definition of Density."

In this lesson, students are introduced to the concept of weight as the heaviness, or mass and density, of an object. This is the first in a series of lessons about weight. Student watch a video tutorial and then can take an online quiz.

In this lesson, students see that an object with a larger size does not necessarily have a larger weight than an object which is smaller in size. This lesson will help students understand the relationship between weight and density....

Learn how to solve for density when you need to calculate the volume of a cube. [2:49]