Archive for July, 2011

August – hot air

Saturday, July 30th, 2011

This month the U.S. is having a serious heat wave.  While your residents stay safe indoors, here is an experiment they can watch and learn about heat.

Materials: Thin black trash bag, twist tie, rock, string and access to an air conditioner.

Process: Hold the open bag over the air conditioner vent. Fill with cold air and tie shut. Tie the bag to the rock with light string. Now place the bag and rock in a sunny filled place on a very hot day.

Result:  The air in the bag will be heated by the sun and because hot air rises you and your residents can watch a mini-hot air balloon of your own making!

July 2011 – Birds

Friday, July 1st, 2011

Summer is warm and wonderful and a great time to enjoy the many birds that fill the skies. As we plan to celebrate the Forth of July, here is a way to celebrate the American Bald Eagle.

The Bald Eagle begins life with a dark head and as he/she ages the head feathers turn white. A Bald Eagle has a white head at age five.  This bird weighs no more than 8 pounds as an adult and yet has a wing span of seven feet!  Sharp eyes enable an Eagle to spot a mouse two football fields away in distance. Eagles can retrieve a fish from a lake, but remain always on the edges of the water. They can not drive into water for prey because in deep water they would drown.

Experiement: To demonstrate  bird eggs composition.

Materials:  egg,  drinking glass, white vinegar

Process:  Set a raw egg in a glass of white vinegar so that it’s completely covered in the liquid. Let the egg sit in the vinegar for about 3 days and then take it out and rinse it in water.

Result: The egg shell will disappear because vinegar is a type of acid dissolved the calcium carbonate that the shell is made out of. The interior yolk of the egg will remain because it is surrounded by a membrane.

If you were to set the egg in vinegar for a day and then remove it while some shell remains, then place the egg on a table exposed to air, you will see the shell re-harden as carbon is pulled from the atmosphere onto the shell.