All atoms have an electrical charge which can be positive, negative or neutral. When you release the rubber, the pressure drops, cooling the air, and the excess vapour condenses on particles of powder in the air, clouds are created. Make your own lava lamp You will need: A clear plastic bottle with a tight lid, a dropper, cooking oil, food colouring and salt.What you do: Pour water into the bottle until it is two-thirds full Add a few drops of food colouring. Slowly pour in enough oil to form a layer on top of the water. Sprinkle a few pinches of salt on top of the oil and see what happens! Keep adding more salt to make your experiment last longer.What happens next: The water and oil do not mix. He would roar around London in a Lamborghini with a huge mayoral flagpole, shooting cyclists.
I hope he doesn't go for it."I suspect the same to be true of staff at City Hall, fretting over the possibility of spray-on jeans becoming uniform.pandora independent.co.uk. Salt and marble mystery You will need: A plastic test tube with an end cap or cork, salt and a marble. What you do: Put the marble in the test tube and fill the test tube three-quarters full with salt, then seal the end of the test tube with a cork. Shake the tube and see what happens.What happens next: The marble travels through the salt until it is at the top of the test tube. Wrap the band tightly around the rim to keep the rubber in place. Push on the rubber until it is depressed a little way into the jar. After 15 seconds quickly remove your fist.What happens next: When you push down the air is compressed and warmed, so it can hold more water vapour. The proteins in gum arabic break the surface tension of the water molecules, releasing the CO2 gas.
As well as this, as the sweets dissolve, tiny pits form on their surface, where CO2 bubbles can form. As the gas is released so quickly, it takes a lot of the bottle's contents with it. Clouds in a bottle You will need: A large glass pickle jar, a balloon, a large rubber band, chalk dust or talcum powder, cold water.What you do: Wash the jar and put an inch (25mm) of water in the bottom. Cut the balloon to form a sheet of rubber, cover the mouth of the jar with it, and hold a book on top to keep it in place After 10-15 minutes, remove the book and rubber.
