What is fog?

Thanks to FreeFoto.com for the image :)

Thanks to FreeFoto.com for the image 🙂

As I was standing, watching the Under 12 Gold play football this morning, I couldn’t see the goal posts at the other end of the field because it was so foggy, it was then I started wondering to myself…What is fog and where does it come from?

So, I have done some research and here is what I have found.

Air is made up of gasses and contains a certain amount of invisible water vapour (water droplets so small that we can’t see them). Fog is created when the air becomes cool (like on a wintry morning) and cannot hold as much water vapour , the air it becomes supersaturated, that means the invisible water vapour turns into bigger water droplets, and then turns into fog.

For more information, have a look at the BBC Weather Centre on Fog, the URL is http://www.bbc.co.uk/weather/features/understanding/fog.shtml

or have a look at Weatherwize Kids the full URL is http://www.weatherwizkids.com/cloud.htm

They have some wonderful information on clouds too!

For some spectacular photos of fog from all over the world, go to http://www.chitambo.com/clouds/cloudshtml/fog.html

Do you like TV and Science?

If so, you might like to check out SCOPE.

Scope is a science TV show for kids (and adults too!) made by the CSIRO and Network 10.

It is on Network 10 Monday mornings at 7.30 and repeated on Saturday morning at 8 (in Melbourne, Australia)

It is presented in a fun and funky way, no stodgy boring old scientists in sight 🙂

The star of SCOPE is a wacky scientist from the CSIRO called Dr. Rob.

In most episodes Dr Rob introduces you to a topic. Depending on what the topic is, specialist scientists or experts may tell you more.

There are activities to do (which you will find on the website) and usually kids from the Double Helix Club demonstrating the activities for you.

It’s heaps of fun and really interesting too!

To have a look at the website, there is a link on the left hand side of the page (under LINKS), or you can click here to open in a new window.

The full URL is http://www.csiro.au/scope/

On the website there are links to the episodes, the activities, profiles of the star scientists and a Teacher Zone with lesson ideas.

There is a huge range of episodes covering a wide range of topics like Earth and space, things we build, things that stuff is made from, things that move and living things (and more).

Check it out on TV or on the Web. Let me know what you think 🙂

How do sharks breathe?

Photo: Phil Enright - Thanks Phil ;)

Photo: Phil Enright - Thanks Phil 😉

Have you ever wondered how a shark breathes? I hadn’t really until I saw this most incredible photo of a shark.

The gills were SO big you could see right through them! AMAZING.

So, I started thinking…how do sharks breathe?

Enchanted learning says:

“Sharks use their gills to filter oxygen from the water.  When water passes over the gills, a system of fine blood vessels takes up oxygen from the water”.  You can read the whole article by clicking here.

The web address is: http://www.enchantedlearning.com/subjects/sharks/anatomy/Gills.shtml

If you were after a more detailed explanation…

According to an article in Science World Magazine

“A shark usually swims with its mouth open to force oxygen-rich water to pass over a set of gills housed in a cavity behind its head–a process known as ramjet ventilation. Gill flaps called lamellae absorb and help diffuse oxygen into the shark’s bloodstream. Lamellae also help sharks expel carbon dioxide, a gaseous waste product of breathing, from the bloodstream.”

PBS on-line has a fantastic Web resource called Island of the Sharks

Join two film makers who dive into an Island off Costa Rica to film an IMAX special on sharks! Well worth checking out!

Did you know that seahorses evolved into upright swimmers to fit in with their seagrass habitat?

Seahorse

Originally uploaded by oscar alexander
Thanks to Flikr Creative Commons for the beautiful photo

I love seahorses; next to frogs, they are one of my favourite animals.

So delicate and graceful.

According to a recent article on the ABC Science website, researchers believe seahorses may have evolved into upright swimmers to fit in with the perfect camouflage habitat of sea-grass beds. This evolution may have happened up to 25million years ago.

You can find more information at the original article by clicking here or go to the following address;

http://www.abc.net.au/science/articles/2009/05/06/2562131.htm?site=science&topic=latest

There are very few seahorse fossils so it has been very difficult for scientists to follow their evolution.

Scientists compared seahorse DNA to the Pygmy pipehorse to look for clues.

So clever! 🙂

Can salt store solar energy?

Freefoto.com

Freefoto.com

According to an article in the Scientific American, a power plant in Spain is using molten salt to store solar energy.

Because salts need really high temperatures to turn to a liquid, they are a great way to store heat. The hot salt can be put near water by a heat exchanger, which turns the water into steam and powers the turbines to generate electricity.

For more information, read the article How to Use Solar Energy at Night.

It’s fascinating reading!

The URL is : http://www.scientificamerican.com/article.cfm?id=how-to-use-solar-energy-at-night