2 Plastic cups
2 Plastic Spoons
Food coloring – pick your favorite color
Borax Powder (usually found next to laundry detergent)
What to do:
Combine a tablespoon of borax into around 75ml of water in the first cup. Stir until it melts.
Mix a tablespoon of PVA glue with two tablespoons of water. Add some drops of food coloring. Stir well until well mixed.
Add one tablespoon of the borax solution to the glue mixture. Stir well and see the mixture turn to slime.
Keep the slime for 30seconds and then pick it up!
Borax causes cross-links among the long strands of the PVA. This stops the strands from sliding over each other making this an instance of a Non-Newtonian Fluid.
Next? Play about with the ratios of the substances to make different types of slime – stretchy, springy, bouncy and wet slimes can all be made by experimenting with how much borax you add.
2. Rocket Science – Pocket Rockets
NASA isn’t the only ones who can make rockets!
A ye olde photo film cannister
Small piece of blu-tak
Water colouring or paint (optional)
What to do:
Take the lid of the cannister and stick the blu-tak to the inside. Next, carefully but firmly stick your alka-seltzer tablet to the blu tack. Fill the cannister half way with water. Firmly close the lid. You now have a fuelled pocket rocket. Simply turn upside down and step back.
This is simply an application of pressure. As the alka-seltzer dissolvers, it releases carbon dioxide. Because the cannister is air tight, it has nowhere to go! The pressure builds until it goes POP!
Next? Experiment with different amounts of water and brands of fizzing tablets. I play a trick where I count in my head whilst talking and snap my fingers just as each pocket rocket takes off.