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This water tower provides water to the surrounding area. It is high above the ground because the further from the ground it is, the greater the pressure will be. The greater the pressure, the further from the water tower people can use the water. If it wasn't for the pressure, we would barely get anything out of our taps at all, and our toilets would no longer flush.
 The ice cube in this glass of water is buoyed up due to it displacing an equal amount of weight of water as it weighs itself. This is known as Archimedes' Principle. Buoyancy is when an object is placed in a liquid and seems not to weigh anything. In reality, it is just displacing the same amount of weight of water as it weighs, and so it floats on the top of the water. This is also known as the law of flotation.
If the ice was not in the water, the water level would be lower. The water exerts an upward force, or a buoyant force, on the ice cubes. For the ice to float, the buoyant foce must be greater than that of the pressure from the ice.
  These two pictures represent Bernoulli's Principle, which helps a paper airplane to achieve flight. The pressure underneath the wings of the plane is greater than the pressure above the wings, which cause the plane to stay in the air. The air flow on top of the wings is faster than that of the air flow underneath the wings, keeping in line with Bernoulli's Principle.
The air pressure inside of an inflated tire is a lot greater than the atmospheric pressure outside of the tire. The air inside the tire is more dense, as well, which is why you can only add a certain amount of air to your tire before it will explode. This demonstrates Boyle's Law, which says that the pressure and the volume of an object is constant as long as the tempeature stays the same. If you were to decrease the volume, you increase the pressure. If you increase the volume, you decrease the pressure.
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