BENGALURU:
Light It Up with Lava Lamps
Objective
Teach your kids about density and solubility making a lava lamp.
Concept
◆ Oil and water do not mix. A lighter liquid floats on top of the heavier liquid. Hence oil floats on top of water.
◆ Eno salt reacts with water to make tiny bubbles of carbon dioxide gas. These bubbles attach themselves to the blobs of coloured water and cause them to float to the surface. When the bubbles pop, the colour blobs sink to the bottom.
You Need
◆ A 500 ml or 1 l plastic soda bottle
◆ Vegetable oil
◆ Food colouring
◆ Eno salt
◆ Water
Instructions
◆ Fill half the bottle with water.
◆ Add about 10 drops of food colouring.
◆ Top it up with oil. The oil will float on the water.
◆ Add a spoon of eno salt.
◆ The lava effect should start as soon as eno salt comes in contact with the water.
◆ Keep adding more eno salt to repeat the effect.
Tip: Switch off the lights in the room and place a strong flashlight under the bottle.
Perpetual Dancers Objective
Teach your kids about surface tension making a self-powered dancing couple.
Concept
Surface tension causes the surface of all liquids to contract and resemble a thin, invisible elastic skin. Dissolving camphor in water reduces the surface tension of water and pushes the camphor along the surface, which propels the device.
You Need
◆ 2 wooden sticks (you could use left over ice cream sticks)
◆ Thermocol
◆ 4 pieces of camphor or mothballs
◆ Glue
◆ Cello tape
◆ A bowl of water
◆ Paper
Instructions
◆ Cut a 2-inch diameter circle from a thermocol sheet. Wrap it with cello tape to waterproof it.
◆ Take two wooden sticks and glue them to form a cross. Attach the cross on top of waterproof thermocol.
◆ On each end of the stick, glue a piece of camphor so that none of the camphor pieces face each other.
◆ Take a paper cut-out of a dancing couple and attach on top of the thermocol.
◆ When set in water, this will spin on its own.
Content courtesy:
Merry Go Learn Education Services