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Listed under:  Density

### Water shoes designed by Lawrence Hargrave, 1870

These are reproduction water shoes or skis designed by Lawrence Hargrave in 1870 to enable the wearer to walk on water. The shoes are hollow, timber and boat-shaped. Eight wooden square boards are hinged to the sole of each shoe and fold parallel to the sole to allow unimpeded forward motion of the shoes. The boards are ...

### Make a lava lamp model using oil and water

Imagine making your very own lava lamp using materials from your kitchen and bathroom. Watch the Surfing Scientist team show you how it can be done, then try and figure out why it works.

### Salt water density experiment

Discover what density is and how you can test the density of liquids. You will also find out about salt water and how its density is responsible for the circulation of water around the world's oceans.

### Hydrogen and its properties

Imagine the possibilities if we could turn the most abundant element in the universe into a source of fuel. Watch as the Surfing Scientist, Ruben Meerman, investigates the properties of hydrogen and then demonstrates its potential as a fuel when he sets fire to hydrogen-filled soap bubbles.

### Name these mystery objects

Compete in a game show against characters Einstein and Pythagoras to identify three different mystery objects. Each of the objects is the end product of a science demonstration. Compare your ideas and predictions with the host Bernie Hobbs's identification of the objects and her explanation of the science behind them.

### Why does a grapefruit float?

Why does a grapefruit float when it's skin is on, but sink when it's skin is removed? Watch these young scientists perform an experiment with grapefruit in water and discover the connection between grapefruit skin and life jackets.

### Balance is a matter of ballast

Have you seen large ships that carry shipping containers as cargo? In this clip we show you how these ships use ballast to help them balance their load. Find out what ballast is and how it stops a ship from sinking. Also see the massive engines on these big cargo ships.

### Secondary science: visual representations

These seven learning activities, which focus on 'visual representations' using a variety of tools (software) and devices (hardware), illustrate the ways in which content, pedagogy and technology can be successfully and effectively integrated in order to promote learning. In the activities, teachers assist students to understand ...

### Primary Connections: Push-pull

This comprehensive teacher resource explores pushes and pulls through a series of collaborative inquiry-based learning activities. Observations and evidence are gathered about how these forces(pushes and pulls) act in air and water, and on the ground, and the effect of the pull of gravity is covered. Eight structured lessons ...

### Backyard Science: forces

This resource, including student videos, provide opportunities for students to identify types of forces, determine whether forces are balanced or unbalanced and compare water and air resistance. They will conduct an investigation into the relationship between friction and different types of surfaces. Students will design, ...

### Seeing with sound: sound lab tour

Explore how sound travels as a wave. Examine diagrams and simulations to answer a series of questions about sound properties. For example, identify the effects of compression waves on the vibration speed of particles. Test the effects of changing wave properties: frequency, wavelength and amplitude. Transmit sounds in a ...

### Seeing with sound

Explore how sound travels as a wave. Examine diagrams and simulations; answer questions about sound properties. Test the effects of changing wave properties: frequency, wavelength and amplitude. Transmit sounds in a range of mediums: air, water, steel or a vacuum. Find out how echolocation works. Measure speed and direction ...

### Kitchen chemistry: experiment and mystery: level 1

Test the physical properties of kitchen substances such as pepper, detergent and butter. See whether they float or sink, foam or dissolve in hot or cold water. Test whether stirring makes a difference. Test and identify two substances such as cream or peanut butter. This learning object is a combination of two objects in ...

### Kitchen chemistry: experiment and mystery: level 2

Test the physical properties of common substances such as salt, detergent and cream. See whether they float or sink, foam or dissolve in hot or cold water. Test whether stirring makes a difference. Test and identify three mystery substances such as honey, shampoo or methylated spirits. This learning object is a combination ...

### Kitchen chemistry: experiment: level 1

Test the physical properties of kitchen substances such as raw sugar, olive oil or salt. See whether they float or sink, foam or dissolve in hot or cold water. Test whether stirring makes a difference. This learning object is one in a series of four learning objects. The series is also packaged as two combined learning objects.

### Kitchen chemistry: experiment: level 2

Test the physical properties of kitchen substances such as cream, detergent or bicarbonate of soda. See whether they float or sink, foam or dissolve in hot or cold water. Test whether stirring makes a difference. This learning object is one in a series of four learning objects. The series is also packaged as two combined ...

### Kitchen chemistry: solve the mystery: level 1

Test the physical properties of two unknown kitchen substances such as cream or olive oil. See whether they float or sink, foam or dissolve in hot or cold water. Test whether stirring makes a difference. Look up a data table of known properties and identify the unknown kitchen substances. This learning object is one in ...

### Kitchen chemistry: solve the mystery: level 2

Test the physical properties of three unknown kitchen substances such as detergent, cream or olive oil. See whether they float or sink, foam or dissolve in hot or cold water. Test whether stirring makes a difference. Look up a data table of known properties and identify the unknown kitchen substances. This learning object ...

### What the world is made of

Use the 'particle model' to explore properties of matter. Compare the arrangement and movement of particles in the three phases of matter: solids, liquids and gases. Explore how substances can change between the three phases. For example, look at what happens when water changes state through a physical process such as melting ...

### What the world is made of: properties of liquids

Explore why ice floats in water. Notice that water expands when it freezes, so a block of ice has fewer particles than the same volume of water. Explore why liquids flow at different rates. Compare the viscosity of substances such as honey and water. This learning object is one in a series of six objects. The series is ...