Posts Tagged ‘everyday science’

Many students would still find it confusing to understand the phenomenon of high tide and low tide.  What causes it and why?


Simple reason is to associate it to gravity of the Earth and the Moon, and the pull of force is called gravitational force. Gravitational force exists between two objects with mass.  (more…)


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Our brain is undoubtedly the most powerful component of our body, but I do not mean there is anything less important. Every bit that makes up our anatomy is as significant as those which are very obvious like our eyes, or nose, or mouth. Here are some trivia about this most incredible creation in the universe.

(photo from google images) (more…)

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The sky is blue especially during bright days due to Rayleigh scattering. This scattering is the elastic scattering of electromagnetic radiation including light, by particles much smaller than the wavelength of the light. It can happen notably when light travels through gases or air. Rayleigh scattering of sunlight results in diffuse sky radiation, which is primarily the reason why the sky is blue and the sun look yellow.

As light travels through the atmosphere, most of the longer wavelengths just pass through straight away whilst some of the red, orange and yellow light, is affected by the air. Much of the shorter wavelength light, like the blue wavelength, is absorbed by the gas molecules, which is then radiated in different directions. It scattered all around the sky and so the blue colour seemed to occupy much of the sky.

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How can you get salt from a rock salt or seawater? This is a simple classroom demo to show that the common salt in the kitchen is mined from underground or can be taken out from the seawater. (more…)

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An activity that can be done as a class experiment. Just make sure materials and equipment are available for the students.  If not readily accessible in your school, ask groups to bring in materials.

This activity can be used when discussing about the importance of water.  As a springboard of the topic, prepare pictures or powerpoint slides on water pollution, water scarcity in different parts of the world, sources of water, and etc.  When it rains, water penetrates into the ground and as it passes through it, the water is filtered by the rocks, and sand, and soil, and eventually comes out as clean water at a spring or wells. (more…)

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