PBS
Pbs Learning Media: Floating and Sinking: Hot Air Balloons
Why do hot air balloons float? This resource from the NOVA Web site offers a series of interactive activities that illustrates the physics of hot air balloons.
Science is Fun
Science Is Fun: Bowling Balls Float or Sink?
In this experiment, you test whether two different bowling balls will float or sink, then determine the density of each of the balls to see if they are less than that of water.
Better Lesson
Better Lesson: Floating and Sinking Sorting in Science
Students sort objects according to whether they sink or float.
PBS
Pbs: Sesame Street: Science
A collection of interactives, videos, and documents on a variety science concepts.
Science is Fun
Science Is Fun: Sinking and Floating Soda Cans
An experiment to determine if either a regular or a diet can of soda will float or sink when placed in water, and what causes this.
Science and Mathematics Initiative for Learning Enhancement (SMILE)
Smile: Density in Relation to Float and Sink
Students find the densities of objects based on sinking or floating in this activity that demonstrates Archimedes Principle.
Science Buddies
Science Buddies: How Much Weight Can Your Boat Float?
Have you ever wondered how a ship made of steel can float? In this project you'll investigate how much weight boat hulls of various shapes and sizes can support without sinking.
Science is Fun
Science Is Fun: The Cartesian Diver
A simple experiment in buoyancy where you discover how to make a packet of sauce or candy float or sink at will, and why you are able to do this.
Science Education Resource Center at Carleton College
Serc: Investigating Density in Solutions: How Can You Make an Egg Float?
In this activity, young scholars will learn about density by determining how to make an egg float in water. By the end of the lesson, students will understand that density and weight are different and that density matters in floatation....
Science Education Resource Center at Carleton College
Serc: Density of Solid Objects
In this science inquiry, students investigate whether volume or density of objects determine the floating or sinking in water. Using a rock and a block of wood teachers engage students in the discussion of density, mass and volume.
Science is Fun
Fun Science: Bowling Balls: Sink or Float?
For a dramatic illustration of density check out this demonstration. It's simple to do, only requiring a bowling ball and some water.
Museum of Science
Museum of Science and Industry: Online Science: Design a Submarine
Become an engineer, and design a submarine that moves in the water like a real submarine. Try making it sink, float, and hover in the water.
Exploratorium
Exploratorium: Science Snacks: Condiment Diver
Use a condiment packet as a Cartesian diver to show how pressure changes cause the "diver" to float, sink or hover.
Center of Science and Industry
Cosi Columbus: Buoyant Bubble [Pdf]
Learn about density in this hands-on science experiment. Includes full list of materials, procedures, and scientific explanation of what makes an object float or sink. [PDF]
Science is Fun
Science Is Fun: Dancing Raisins
An experiment in buoyancy which involves making raisins float by using carbonated soda pop. Students then try the same test with other materials. Instructions for making one's own carbonated liquid are also provided.
Science is Fun
Fun Science: Sinking and Floating Soda Cans
Why do some pop cans float in water while others don't? This easy experiment is a great example of the principle of density.
My Science Site
Density Demonstration: Coke vs. Diet Coke [Pdf]
Help students brainstorm and find a solution as to why Diet Coke floats and Coke sinks. Student will learn to define what density is as they engage in this creative lab. This resource is in PDF form; requires Adobe Reader.
Staten Island Children's Museum
Staten Island Children's Museum: Sea of Boats
Use this activity guide to discover about boats and learn some water science.
Bill Nye
Bill Nye: Eggs Speriment
Try this at-home science experiment to learn if salt affects the way things float.
Alabama Learning Exchange
Alex: What's the Matter: A Sinker or Floater?
Students will explore matter that sinks or floats when submerged in water and that matter is categorized as either a sinker or a floater. Students will work actively in small, cooperative learning groups as well as gather in a whole...