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Bed of Nails

Bed of Nails AP6769
Catalog Number
Bed of Nails
Product Description

By: The Flinn Staff

Dramatically show that pressure is a force per unit area with this familiar demonstration. Place an inflated balloon on a wood block full of sharp nails. Add a 1000-g mass to the “floating” board on top of the balloon and amazingly the balloon does not pop! Continue adding more weight until the balloon pops. Repeat the demonstration using a single nail. Which bed of nails will support more weight before the balloon pops? The wood block with many nails holds significantly more weight without popping the balloon, compared to the single-nail block. This effectively shows that as the surface area (number of nails) decreases, the pressure increases. Multi-holed board allows for a variety of nail quantities and combinations to show increasing or decreasing surface area. Balloons for fifty demonstrations are provided. Replacement balloons are available. A weight set is required, but not included.

Balloons, Latex, Sphere, 5", Pkg. of 50

Helium quality latex balloons, assorted colors. Twelve-inch balloon will hold approximately 11 L of gas when fully inflated (approximately one-half of a mole).  A lecture bottle of helium will fill about five 12" balloons.
Hook Weight Set, Economy Choice
Black painted weights have a non-movable hook on top. Bottoms of weights are recessed and contain a weigh-below bar allowing weights to be hung from each other. Weight set includes one each of 10 g, 50 g, 100 g, 500 g, and 1 kg, and two each of 20...
Additional Resources
No Additional Resources at the time.
Flinn Catalog/Reference Manual Page 615
Flinn Middle School Catalog/Reference Manual Page 358
P.O. Box 219, Batavia, IL60510



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