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Montshire at Home:

Which is heavier, a pound of feathers or a pound of lead? They both weigh the same, of course, but the pound of lead takes up little more than 2 cubic inches of space, while the pound of feathers is as big as a pillow. Why? Because lead is much more dense than feathers, meaning it has more mass packed into the same volume.

Density is this week’s science topic on Montshire at Home. Check out the videos and downloads of experiments demonstrating density that you can do yourself with salt, water, food coloring, cups, balls, and a few other items hanging around the house.