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Pressure Section 1

By: Christina Amato, Alexandra D’Alessio, Tabitha LaRocca , Alexandrea Papadelias, Mike Rosa, Isaiah Smith. Pressure Section 1. Pressure. Pressure is equal to the force exerted on a surface area divided by the total area over which the force is exerted.

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Pressure Section 1

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  1. By: Christina Amato, Alexandra D’Alessio, Tabitha LaRocca, Alexandrea Papadelias, Mike Rosa, Isaiah Smith PressureSection 1

  2. Pressure • Pressure is equal to the force exerted on a surface area divided by the total area over which the force is exerted. • The relationship of force, area, and pressure are summarized by a formula. Pressure= Force Area

  3. Pressure and Area • Force and pressure are closely related, but aren’t the same thing. • Pressure decreases as the area over which a force is distributed increases. • The larger the area over which the force is distributed, the less pressure is exerted. • For example, in order to stand on snow without sinking, you cant make yourself way the same as a bird. • However you can change the area over which you exert the force of your weight.

  4. Calculating Pressure • Pressure is equal to the force exerted on a surface divided by the total area over which the force exerted. • Force is measured in Newton's(N). • Area is measured in square meters(m²).

  5. Fluid Pressure • A fluid is a material that can easily flow. As a result, fluids can change shapes. • Liquids such as water, oil, gases such as air and helium are examples of fluid.

  6. What Causes Fluid Pressure • All of the forces exerted by the individual particles in a fluid combine to make up the pressure exerted by the fluid. • Fluid pressure is the total force exerted by the fluid divided by the area over which the force is exerted.

  7. Air Pressure • Air, is the mixture of fluid that makes up Earth’s atmosphere. • Air exerts pressure because it has mass.

  8. Balanced Pressure • Hold out your hand with your palm up. You are holding up air. The surface area of your palm is about 100 cm ². So, the weight supported by your hand is about 1,000 Newton's or about the same weight as a large washing machine.

  9. Atmospheric Pressure and Elevation • At higher elevations, there is less air above you and therefore less air pressure. • As your elevation increases, atmospheric pressure decreases.

  10. Water Pressure and Depth • Fluid pressure depends on depth. • For example: The pressure at one meter below the surface of a swimming pool is the same as one meter below a lake. If you dive deeper into either a body of water, pressure becomes greater as you descend. The deeper you swim, the greater pressure you feel. • Water pressure increases as depth increases.

  11. Measuring Pressure • You can measure atmospheric pressure with an instrument called a barometer. • There are two types of barometers: a mercury barometer and an aneroid barometer. • Weather forecasters use the pressure reading from a barometer to help forecast the weather. • Rapidly decreasing atmospheric pressure usually means a storm is on its way. • You may hear barometric pressure readings usually expressed in millimeters, inches, or another unit called millibar.

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