There are many ways to demonstrate pressure through our daily activities. Here is the easy one to explore or demonstrate pressure: 1) Take a plastic water bottle and fill it with water to its half way. 2) Place a straw into its neck part and seal the leaky edges using putty or clay. 3) Blow heavily into the straw which creates increased air pressure inside the bottle. 4) This increased pressure inside the bottle pushes the water out of straw like a fountain.