Changing Temperatures Materials Required: Four empty 2-litre plastic bottles A 2-litre cola bottle Five thermometers Strings Five sticks Table Sunny window Red, blue and yellow food colouring Pencil and paper Clock An ice-skating ring was developed in the area. A big ring was formed out of asphalt and it was filled with water. In winter, the temperature dropped well below freezing point. However, the water in the ring never froze. Maybe...

Changing Environments Materials Required: An adult with a drill Plastic soda bottles with screw caps A large pail Small stones Three feet of plastic Aquarium tubing rubber band While some air carriers are known as heavier-than-air (like airplanes and helicopters), there are also some carriers, which are lighter-than-air (like balloons and gliders). These gas balloons are still less than the weight of the air that would take up the same amount...

Into Thin Air Materials Required: Measuring cup Soda bottle Pie plate Water The change of liquid into vapor is known as Evaporation. Water evaporates into the air. Morning dew collected on a leaf is concentrated by noon on a hot day. How long will a cup of water take to evaporate? There are certain factors involved in it, namely movement of the air, its dryness and the temperature. Among those, the...

A Natural Screen Materials Required: 1. Art and construction supplies A good way to contain the heat energy in the house and also to lower the energy costs would be to protect the house from strong, cold winter winds. Take the example of farms. Due to the large expanse of land surrounding the farmer’s land, where he carries out his farming, you see long rows of tall trees around the house,...

Heat Retaining Bricks Materials Required: Soil Water Bowl A large mixing spoon Straw or dry grass Two thermometers Many people live in houses made of wood. In South-western United States and in Mexico, where there are not many trees, people build houses made of mud bricks called Adobe. Even the ancient Babylonians and Egyptians, who lived in treeless desert areas, used Adobe bricks. These bricks were made of sand clay, water...

Recycling Materials Required: Empty boxes (cereal, noodles, sugar, cracker etc.) Paper and pencil Many companies use recycled cardboard and papers to package their products these days. The recycled boxes have symbols on them indicating they are recyclable. The boxes which have been recycled are grey in colour on the inside as compared to the non-recycled boxes. Collect various food boxes, such as cereal, noodles, sugar, cracker, pet food. Write the product...

Conserving Fossil Fuels Materials Required: Paper and Pencil Ever wondered why people burn items like coal, oil and natural gas? These elements contain a sort of energy in them, which is released, when they are burnt and this energy is later used by the people for their various activities. This sort of energy is called “fossil fuel” and it is basically the remains of animal life and vegetation, that contain energy...

Hanging in Mid-Air Materials Required: A hair dryer Several hardbound books A ping-pang ball Stiff cardboard of about 5-6 inches A square A table Though it might look like magic to suspend a ping-pong ball in mid-air, actually it’s far from that. The secret that you may think belongs to this magic trick is balancing air push and pressure. Place a hair dryer on a table, point it in such a...