Density - ScienceDemos.org

Ball Bearing Sinks, Ping Pong Ball Rises

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A ball bearing is placed on top of a container of corn, swirling it causes the ball bearing to look like its transformed to a ping pong ball.

Bottle Thermometer

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Water is put in a jar (with food colouring), and a straw or glass tube is sealed into the top, heating the water will cause the water to rise.

Bubbles Floating on Carbon Dioxide

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Carbon dioxide (heavier than air) is produced in a tray, either with dry ice or vinegar/sodium bicarbonate. A blown bubble will float on it.

Cartesian Diver

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An empty soda bottle is filled with water, and a dropper or similar placed inside, squeezing the bottle causes the dropper to fall.

Colourful Sugar Density Tower

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Different density coloured solutions are made by dissolving varying amounts of sugar in water, and they are layered on top of each other.

Density Tower

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Several liquids (some with food colouring added) are layered on top of each other in a measuring cylinder. Some objects will float between the layers.

Floating a Boat on Sulfur Hexafluoride

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An aquarium is filled with Sulfur Hexafluoride gas, and an aluminium foil boat and other objects are floated on top because of how dense the gas is.

Floating an Egg in Water/Salt

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An egg is shown to sink in water. Adding enough sugar or salt to the water causes the egg to float.

Floating and Sinking Sodas

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Various cans of soda are put into water. The ones with less sugar float and the ones with more sugar sink due to sugar being more dense than water.

Floating Lemons, Sinking Limes

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Lemons and limes are put in a tank of water, the lemons float and the limes sink. Can be used to investigate scientific method.

Floating Objects on Surface of Water

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Various objects are floated on water using surface tension. Paper clips sink when initially added, but can be made to float by putting on paper first.

Hot Air Balloon

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A plastic dry cleaning bag is filled with warm air from a hair dryer, causing it to rise.

Hot Water Rising, Cold Water Sinking

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Small bottles are filled with hot water (coloured red) and cold water (blue), and placed on a platform in a jar of water, the hot rises and cold sinks.

Ice cube and Oil

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An ice cube floats on corn oil, but as it melts the water sinks to the bottom.

Lava Lamp

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Vegetable oil and water are layered, with colouring. Dropping an alka-seltzer table in causes the layers to move around.

Lava Lamp in a Cup

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Vegetable oil is layered on water in a cup. Adding salt causes the oil to sink, it then starts to float as the salt dissolves in the water.

Observing Convection Currents

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A bottle of hot water and cold water are coloured with different colours of food dye. The bottles are connected and convection currents observed.

Salt Water Density Straw

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Different density salt water solutions are made, with different colours. They are then sucked into a clear straw.

Sinking Ice Cube

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An ice cube floats on water but sinks in ethanol or isopropyl alcohol.

Snow Globe

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Flowers of sulfur is added to water, adding Calgon water softener makes the sulfur sink. The mixture can then be shaken up to make snow.

Underwater Volcano

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A vial containing hot water and food colouring is sealed with aluminium foil and lowered to the bottom of a beaker of cold water, the foil is pricked.